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Free courses on VoIP, SMS, eSIM, and reselling โ€” real simulations, real quizzes graded on our server (never in your browser), and progress that's actually saved to your account.

โญ Featured
โญ Featured beginner
Chinese HSK 1: Zero to Hero
Absolute beginner Mandarin โ€” pinyin and the four tones, greetings, numbers, family, and your first real sentences.
11 levels Start now โ†’
โญ Featured beginner
Public Speaking Foundations
The real basics โ€” why the fear happens, how to control your breath and voice, a speech structure that always works, body language that reads as confident, and how to stop saying "um."
7 levels Start now โ†’
Telecom Basics for Beginners: Zero to Hero
VoIP, eSIM, SMS, and DID reselling business setup, pricing, scams, and scaling โ€” broad telecom industry knowledge with a fast, free path into reselling through 6X.
beginner 12 levels 25 min
VoIP Basics for Beginners: Zero to Hero
Voice over IP fundamentals, SIP routing, wholesale/retail margins, scam-spotting, and customer acquisition โ€” a focused 7-level path to reselling VoIP minutes.
beginner 7 levels 15 min
SMS Basics for Beginners: Zero to Hero
SMS fundamentals, bulk messaging, OTPs, wholesale/retail margins, scam-spotting, and customer acquisition โ€” a focused 7-level path to reselling SMS.
beginner 7 levels 15 min
eSIM Basics for Beginners: Zero to Hero
eSIM fundamentals, the reseller industry, wholesale/retail margins, and scam-spotting โ€” general industry knowledge with real platform examples, since eSIM isn't a 6X self-serve product.
beginner 7 levels 15 min
A2P Messaging for Beginners: Zero to Hero
Application-to-Person messaging (OTP, alerts, marketing) at scale โ€” compliance, pricing, and customer acquisition for the business-messaging niche of SMS reselling.
intermediate 7 levels 15 min
Billing Strategy for Telecom Beginners: Zero to Hero
Pricing models, payment gateways, fraud prevention, and revenue optimization โ€” general billing strategy for running any telecom reselling business.
intermediate 7 levels 15 min
Number Porting for Beginners: Zero to Hero
How number porting actually works industry-wide, the real timeline and requirements, and how to spot porting scams โ€” general knowledge, since porting-in isn't a self-serve 6X feature.
intermediate 7 levels 15 min
VoIP Call Origination for Beginners: Zero to Hero
Receiving and routing incoming calls at scale โ€” real 6X Inbound Numbers and Basic IVR, pricing, compliance, and customer acquisition.
intermediate 7 levels 15 min
Rate Management for Telecom Beginners: Zero to Hero
How wholesale/retail rates actually work on 6X's platform โ€” using the live Rates page, Route Test tool, and Sell Rates tool to price and protect your margin.
intermediate 7 levels 15 min
DID Basics for Beginners: Zero to Hero
Direct Inward Dialing numbers, real 6X Inbound Numbers assignment, pricing, and reselling โ€” a real, self-serve 6X wholesale product.
beginner 7 levels 15 min
SIP Trunk Basics for Beginners: Zero to Hero
The protocol layer under wholesale voice reselling โ€” SIP trunking, real current 6X voice rates, and reselling termination minutes.
intermediate 7 levels 15 min
PBX Basics for Beginners: Zero to Hero
Business phone systems โ€” extensions, IVR menus, call queues โ€” general industry knowledge, since a white-label PBX resale product isn't part of 6X's wholesale account.
beginner 7 levels 15 min
ORTP Routes for Beginners: Zero to Hero
What "premium quality" voice routing actually means (MOS, jitter, packet loss) โ€” general industry knowledge for evaluating any provider's quality claims, including 6X's.
intermediate 7 levels 15 min
TDM Routes for Beginners: Zero to Hero
Legacy circuit-switched telecom (T1/E1/PRI) and how it bridges to modern VoIP โ€” general industry knowledge, since 6X's own wholesale interconnect is SIP/IP-based.
intermediate 7 levels 15 min
NCLI Routes for Beginners: Zero to Hero
Why non-verified caller-ID routes are cheaper, when (rarely) that tradeoff is appropriate, and the real compliance risks โ€” this is risk-evaluation knowledge, not a guide to bulk/robocall reselling.
intermediate 7 levels 15 min
CLI Routes for Beginners: Zero to Hero
Why verified caller ID matters โ€” answer rates, trust, and compliance (STIR/SHAKEN) โ€” general industry knowledge for evaluating any voice route, including 6X's.
intermediate 7 levels 15 min
OTP Routes for Beginners: Zero to Hero
Why OTP/2FA SMS delivery is treated differently from regular messaging โ€” general industry knowledge for evaluating any SMS route's reliability, including 6X's.
intermediate 7 levels 15 min
SMS Marketing / Promo Routes for Beginners: Zero to Hero
High-volume promotional SMS done right โ€” consent, DND compliance, and real economics โ€” general knowledge for running compliant SMS marketing campaigns.
intermediate 7 levels 15 min
SBC (Session Border Controller) for Beginners: Zero to Hero
What protects a VoIP network at the edge โ€” security, NAT traversal, topology hiding โ€” general infrastructure knowledge, not a 6X product.
intermediate 7 levels 15 min
SS7 Security for Beginners: Zero to Hero
Why the global telecom signaling protocol has real, well-documented weaknesses, and how the industry defends against them โ€” general security education, not a 6X product.
advanced 7 levels 15 min
IoT SIM for Beginners: Zero to Hero
SIMs built for machines, not people โ€” general industry knowledge with real M2M platforms as examples, since IoT connectivity isn't a 6X product.
beginner 7 levels 15 min
Marketing & Customer Acquisition for Telecom Beginners: Zero to Hero
How to actually find and win customers for VoIP, SMS, eSIM, DIDs, or anything else you resell โ€” general marketing knowledge that applies across every course in this Academy.
beginner 7 levels 15 min
Termination for Beginners: Zero to Hero
Sending calls out to be delivered on the real phone network โ€” 6X's real wholesale voice product, pricing, compliance, and finding customers.
intermediate 7 levels 15 min
Number Masking for Beginners: Zero to Hero
Privacy numbers for ride-hailing, delivery, dating, and marketplace apps โ€” general industry knowledge with real platforms as examples, since dynamic number masking isn't a 6X product.
beginner 7 levels 15 min
Voice Broadcast / Call Blasting for Beginners: Zero to Hero
Send pre-recorded or TTS voice messages to a whole list at once โ€” 6X's real, self-serve Voice Broadcast tool in the business hub, with consent built in from the start.
intermediate 7 levels 15 min
Call Centers & Dialers for Beginners: Zero to Hero
Dialer types explained, plus 6X's real self-serve Power Dialer for working through a call list efficiently โ€” general industry knowledge with one real 6X tool.
intermediate 7 levels 15 min
Unified Communications (UC) for Beginners: Zero to Hero
Voice + video + chat + presence in one platform โ€” general industry knowledge with real platforms as examples, since UCaaS isn't a 6X product.
beginner 7 levels 15 min
Dedicated Ports for Beginners: Zero to Hero
Guaranteed concurrent-call capacity โ€” general industry knowledge, plus the two real 6X concepts that come closest (your account's concurrent-call cap and 6X Switch's dedicated IP).
intermediate 7 levels 15 min
SIP Errors for Beginners: Zero to Hero
Decode SIP response codes and debug common call failures โ€” general technical knowledge every VoIP reseller needs, plus 6X's real Route Test tool for diagnosing issues.
intermediate 7 levels 15 min
Class 4/5 Switch for Beginners: Zero to Hero
Understand tandem (Class 4) vs. local-exchange (Class 5) switching โ€” and how 6X Switch is a real, self-serve Class 4 softswitch rental with your own vendor pool and dedicated IP.
advanced 7 levels 15 min
Customer Onboarding Process in Telecommunications for Beginners: Zero to Hero
Why telecom onboarding involves real review steps (not instant signup) โ€” general onboarding principles plus 6X's actual wholesale registration โ†’ approval โ†’ go-live flow.
beginner 7 levels 15 min
Telecom Regulations and Compliance for Beginners: Zero to Hero
A global, non-country-specific overview of telecom regulatory principles โ€” licensing, anti-fraud, consumer protection โ€” so you know what to research for your own jurisdiction.
intermediate 7 levels 15 min
Negotiation & Payment Terms for Telecom Beginners: Zero to Hero
Negotiate better rates and protect your cash flow โ€” general business skills, grounded in the real fact that 6X itself runs strictly prepaid, no net-30 from 6X.
intermediate 7 levels 15 min
Telecom Network Security for Beginners: Zero to Hero
Understand the real threats (toll fraud, IRSF, CLI spoofing) and defenses โ€” general industry knowledge grounded in 6X's real, live Fraud Watch monitoring system.
intermediate 7 levels 15 min
Telecom Channel Partner Management for Beginners: Zero to Hero
6X's real, self-serve Sales Partner program โ€” how referral commissions actually work, and how the separate wholesale-reseller path fits alongside it.
intermediate 7 levels 15 min
Route Quality Test Tool Guide for Beginners: Zero to Hero
Test voice and SMS route quality before you commit real traffic โ€” 6X's real Route Test tool plus the free Telecom Test Numbers list.
intermediate 7 levels 15 min
Telecom Cost Calculator Guide for Beginners: Zero to Hero
How to actually calculate telecom costs, margins, and sell prices โ€” using 6X's real public rate deck and the Sell Rates doc, not a broken third-party tool.
intermediate 7 levels 15 min
Billing and Rating Systems in Telecommunications for Beginners: Zero to Hero
How telecom billing and rating actually work โ€” general industry concepts, grounded in exactly how 6X itself rates and bills every call and SMS in real time.
intermediate 7 levels 15 min
Zero Capital to Start a Telecom Empire: Zero to Hero
Start a real VoIP/SMS reselling business with genuinely zero software cost โ€” free wholesale registration, free testing tools, no switch software to buy or run.
beginner 7 levels 15 min
CC Routes for Beginners: Zero to Hero
Call Completion / Carrier-Grade / Clean routes โ€” general industry knowledge about route-quality tiers, applicable to evaluating any voice route including 6X's own real termination product.
intermediate 7 levels 15 min
Carrier Interconnect for Beginners: Zero to Hero
How carriers exchange traffic โ€” direct, indirect, and peering โ€” and why becoming a regular 6X wholesale reseller already gives you real indirect interconnect, no carrier contracts needed.
intermediate 7 levels 15 min
Sales & Account Manager for Telecom Beginners: Zero to Hero
Find, close, and retain telecom customers โ€” general sales and account-management skills applicable to reselling on 6X or referring through the real Sales Partner program.
intermediate 7 levels 15 min
Quantum-Safe Telecom for Beginners: Zero to Hero
Why quantum computing threatens today's telecom encryption, and what post-quantum cryptography is โ€” general industry awareness, not a current 6X product.
advanced 7 levels 15 min
Carrier Relationship Manager for Beginners: Zero to Hero
The real skillset for sourcing and managing your own carrier relationships โ€” most relevant if you run 6X Switch's own vendor pool, not needed for regular reselling.
advanced 7 levels 15 min
Dealing with Stress at Work in Telecommunications: A Practical Guide
Practical, field-tested techniques for staying calm and healthy through outages, escalations, on-call rotations, and 24/7 pressure.
beginner 7 levels 15 min
Benefits of Making Peace with Colleagues in Telecommunications
Why low-drama, high-trust relationships with colleagues are one of the highest-ROI investments in a telecom career โ€” faster resolutions, less stress, faster promotions.
beginner 7 levels 15 min
Getting Along with Colleagues in Telecom: Office & Remote Practical Guide
Practical strategies for building strong, low-conflict working relationships โ€” in the NOC room and across distributed remote teams.
beginner 7 levels 15 min
Telecom Staff Skill Set to Success: A Practical Guide
The real skills that separate average telecom staff from the top performers who get raises, promotions, and long-term job security.
beginner 7 levels 15 min
Telecom Customer Support Skill Set: A Practical Guide
The real skills that drive high CSAT, first-contact resolution, and fast promotions for telecom support agents.
beginner 7 levels 15 min
Telecom Partnership Skills Set & Strategies: A Practical Guide
General partnership-building skills โ€” trust, negotiation, enablement โ€” for anyone managing telecom partnerships, including 6X's own real Sales Partner program.
intermediate 7 levels 15 min
Telecom Working Environment Protocols: A Practical Guide for Staff
The written and unwritten rules that keep a telecom workplace safe, efficient, professional, and drama-free โ€” communication, etiquette, confidentiality, handovers, and incident protocols.
beginner 7 levels 15 min
Telecom Operations & Systems: Practical Training for Staff
Practical, hands-on operations knowledge for NOC, provisioning, billing support, fraud, interconnect, and QA staff โ€” the systems, troubleshooting, and habits that make you effective.
intermediate 7 levels 15 min
Global Payment Netting Strategies in Telecommunications
Why carriers don't pay each other gross โ€” offsetting mutual obligations to cut transfer fees, FX risk, and counterparty risk. General industry finance knowledge.
advanced 7 levels 15 min
Global Peering Strategies in Telecommunications
Transit vs. peering vs. IXPs โ€” how networks connect globally, and how peering strategy cuts cost and latency. General IP networking industry knowledge.
advanced 7 levels 15 min
Telecom Wholesale Settlement Reconciliation
Why carrier settlement numbers rarely match perfectly, and how real reconciliation processes catch revenue leakage before it becomes permanent.
advanced 7 levels 15 min
Wholesale Interconnect Testing for Beginners
Validating a carrier interconnect before trusting it with real traffic โ€” a focused look at bilateral testing methodology, using the real free Telecom Test Numbers tool.
intermediate 7 levels 15 min
MVNO Launch & Operations Guide
A realistic roadmap for launching and operating a Mobile Virtual Network Operator โ€” business models, MNO partnership, operations, and the pitfalls that kill most new MVNOs. General industry knowledge.
advanced 7 levels 15 min
Fraud Detection for Telecom Beginners: Zero to Hero
Understand the most common telecom frauds (IRSF, SIM boxing, CLI spoofing, Wangiri) and how detection actually works โ€” grounded in 6X's real, live Fraud Watch system.
intermediate 7 levels 15 min
5G Core Operations & Monetization Strategies
Modern 5G Core architecture and the monetization models actually generating revenue today โ€” Fixed Wireless Access, private 5G, and network APIs. General industry knowledge.
advanced 7 levels 15 min
SIP Troubleshooting & Packet Analysis: A Basic Practical Course
Quickly diagnose common SIP/VoIP problems using free tools โ€” SIP basics, reading traces, and diagnostic checklists for the most frequent issues.
intermediate 7 levels 15 min
Resolving Disputes with Customers in Telecommunications
De-escalate, investigate fairly, and resolve billing/service disputes in a way that protects both the customer relationship and the company.
beginner 7 levels 15 min
Time Management Skills in Telecommunications
Practical time-management techniques for interrupt-heavy, 24/7 telecom roles โ€” triage, focus blocks, on-call time management, and sustainable energy habits.
beginner 7 levels 15 min
Working Under Pressure in Telecommunications
Stay sharp and effective during real high-pressure moments โ€” outages, fraud in progress, and VIP escalations. Physiological resets, decision-making frameworks, and recovery habits.
beginner 7 levels 15 min
Touch Typing for Beginners: Zero to Hero
Learn real touch-typing technique โ€” hand placement, home row, muscle memory, speed and accuracy โ€” then put it into practice in 6X Typing Quest.
beginner 5 levels 20 min
Chinese HSK 1: Zero to Hero
Absolute beginner Mandarin โ€” pinyin and the four tones, greetings, numbers, family, and your first real sentences.
beginner 11 levels 25 min
Chinese HSK 2: Zero to Hero
Start building real conversations โ€” completed actions with ไบ†, modal verbs, comparisons, directions, feelings, and making plans.
beginner 11 levels 25 min
Locked
Chinese HSK 3: Zero to Hero
The final elementary-level course โ€” experience with ่ฟ‡, resultative and directional complements, conditionals, and handling everyday real-world situations.
intermediate 11 levels 25 min
Locked
Chinese HSK 4: Zero to Hero
Intermediate Chinese begins โ€” the ๆŠŠ construction, passive voice, advanced connectors, abstract topics, and structuring your own opinions.
intermediate 11 levels 25 min
Locked
Chinese HSK 5: Zero to Hero
Advanced Chinese โ€” register and tone, four-character idioms, news vocabulary, debate structures, and the ๆ˜ฏ...็š„ emphasis pattern.
advanced 11 levels 25 min
Locked
Chinese HSK 6: Zero to Hero
The top of the classic HSK scale โ€” literary and academic Chinese, extended chengyu, formal essay writing, and exam strategy for the HSK6 summary-writing task.
advanced 11 levels 25 min
Locked
Chinese Characters Made Easy: Radicals & Memory Tricks
Stop seeing squiggles โ€” learn how Chinese characters are actually built, the ~35 components that unlock hundreds of words, and real memory techniques that make new characters stick.
beginner 9 levels 25 min
Bible Ministry Phrasebook: Preaching Skills
Real, ready-to-use Mandarin phrases for the door-to-door and informal ministry โ€” greetings, presenting a topic, asking questions, using the Bible, and full sample conversations.
intermediate 11 levels 40 min
Chinese for Telecom: Buying, Selling & Route Negotiation
Real conversational Mandarin for the wholesale telecom trade โ€” buying and selling voice/SMS routes, negotiating rates, discussing quality (ASR/ACD), and payment terms.
intermediate 8 levels 30 min
Bible Ministry Phrasebook: Teaching Skills
Vocabulary and phrases for conducting Bible studies and meetings โ€” reading and teaching terms, meeting parts, the 66 Bible books, and how to introduce, discuss, and use scriptures and literature.
intermediate 12 levels 45 min
Bible Ministry Phrasebook: What the Bible Teaches
Core Bible-teaching vocabulary in Mandarin โ€” God, the divine name, Jesus Christ, God's Kingdom, creation, spirit creatures, the Flood, and the last days.
intermediate 10 levels 45 min
Chinese Business Etiquette
The customs, hierarchy, and unspoken rules of doing business with Chinese-speaking partners โ€” greetings, business cards, gift-giving, dining, and how "face" shapes negotiation โ€” plus the vocabulary to navigate it.
intermediate 8 levels 40 min
Memory Improvement: Learn Faster, Forget Less
The actual science of how memory works, and five practical techniques โ€” active recall, spaced repetition, the story method, and more โ€” that make everything else you study here stick.
beginner 6 levels 20 min
Public Speaking Foundations
The real basics โ€” why the fear happens, how to control your breath and voice, a speech structure that always works, body language that reads as confident, and how to stop saying "um."
beginner 7 levels 35 min
Public Speaking: Structure & Persuasion
Know your audience, use the three classic pillars of persuasion, structure a story that lands, and use evidence and rhetorical devices without sounding like a sales pitch.
intermediate 7 levels 35 min
Public Speaking: Advanced Delivery & Impromptu Speaking
Thinking on your feet, handling hard questions, using humor safely, presenting on camera, and carrying yourself with executive presence โ€” the situations no script fully prepares you for.
advanced 7 levels 35 min
Chinese Conversational Fluency I
The connector words, natural fillers, and repair phrases ("what does that mean?", "can you say that slower?") that make real conversation flow โ€” not more vocabulary, but the glue between it.
intermediate 7 levels 35 min
Chinese Conversational Fluency II
Disagreeing politely, structuring a real argument, using idiomatic expressions naturally, and organizing longer spoken thoughts โ€” the tools that separate "understandable" from "fluent."
advanced 7 levels 35 min
Duolingo
Duolingo Chinese Course
Free, bite-sized daily Chinese lessons with speaking and listening practice โ€” a good everyday companion alongside the HSK courses here.
External beginner Free
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Chinese Testing International (Hanban)
Official HSK Exam Info & Registration
The official HSK exam site โ€” registration, syllabus, and past papers straight from the test's own organizers.
External Free info
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italki
italki โ€” 1:1 Chinese Tutors
Live 1:1 conversation practice with native Mandarin tutors โ€” the fastest way to turn HSK grammar into real speaking confidence.
External Paid (per lesson)
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CompTIA
CompTIA Network+ Certification
An industry-recognized networking certification โ€” solid foundation knowledge for anyone working in telecom or ISP operations.
External intermediate Paid exam
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Cisco
Cisco Networking Academy
Free, self-paced networking courses from Cisco โ€” covers the fundamentals behind the infrastructure telecom businesses run on.
External beginner Free
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Coursera (Google)
Google IT Support Professional Certificate
A beginner-friendly IT support certificate covering networking, troubleshooting, and customer service โ€” useful groundwork for telecom support roles.
External beginner Free trial
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freeCodeCamp
freeCodeCamp
A fully free, project-based curriculum covering web development, JavaScript, Python, and data analysis โ€” thousands of hours of real self-paced coursework, no paywall.
External beginner Free
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Harvard (via edX)
CS50: Introduction to Computer Science
Harvard's legendary intro CS course โ€” algorithms, data structures, and real programming in C, Python, and SQL. Free to audit; useful foundation for anyone building or automating telecom tooling.
External beginner Free (audit)
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Google for Developers
Google's Python Class
Google's own free Python crash course, built for people who already know some programming โ€” lecture videos plus real exercises, no signup required.
External beginner Free
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