1. Core Technology & Working Principle
Quectel cellular modules act as the core communication bridge between your hardware (modem, MP SMS gateway, GP VoIP gateway) and global mobile carriers. They convert IP/data/voice signals into cellular radio signals and vice versa, supporting SMS, voice, and data transmission.
1.1 2G GSM Modules (M26/M35)
- Tech: Quad-band GSM/GPRS (850/900/1800/1900MHz), compact LCC package, low power consumption, ultra-stable for basic SMS & low-speed data.
- Use Case: Legacy low-cost SMS, low-traffic IoT, small-scale notifications.
- Critical Note: 2G is shut down in Australia, South Korea, Japan, USA, Canada—do NOT sell or use here.
1.2 4G LTE Cat 1 / Cat 4 Modules
- EC25 / EC20 / EC200A: LTE Cat 4 (150Mbps DL / 50Mbps UL), high throughput for bulk SMS & VoIP calls
- EG91: LTE Cat 1 (100Mbps DL / 50Mbps UL), cost-effective for light-to-medium SMS/voiceQuectel.
- EG25-G: LTE Cat 4 global full-band, all-region compatibility, balanced performance & cost.
All modules use industrial-grade design (−40°C to +85°C), standard AT commands, and full carrier certifications for stable deployment
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2. Head-to-Head Technical Differences
| Series |
Network |
Category |
Region Type |
Key Speed |
Best For |
| M26/M35 |
2G GSM |
GPRS |
Global (2G active areas only) |
Low |
Basic low-cost SMS |
| EC25 |
4G LTE |
Cat 4 |
Regional dedicated |
150/50 Mbps |
High-speed SMS/VoIP |
| EG91 |
4G LTE |
Cat 1 |
Regional dedicated |
100/50 Mbps |
Light traffic, cost-saving |
| EG25-G |
4G LTE |
Cat 4 |
Global full-band |
150/50 Mbps |
Cross-region, global deployment |
| EC200A |
4G LTE |
Cat 4 |
Regional dedicated |
150/50 Mbps |
Regional cost-effective |
| EC20 |
4G LTE |
Cat 4 |
China/India only |
150/50 Mbps |
China/India dedicated |
3. Full Module Selection by Region & Band
Match your target country directly—no guesswork!
3.1 Europe, Middle East, Africa, Asia (SE Asia + Russia)
- Recommended Models: EC25-EUX / EG91-EX / EC200A-EU
- Bands:
LTE FDD: B1,B3,B5,B7,B8,B20,B28
LTE TDD: B38,B40,B41
WCDMA: B1,B5,B8
GSM: B3,B8
- Certifications: CE, UKCA, RCM, NCC,GCF
3.2 USA & Canada
- Recommended Models: EC25-AFX / EG91-NAX
- Bands:
LTE FDD: B2/B4/B5/B12/B13/B14/B66/B71
WCDMA: B2/B4/B5
- Certifications:FCC, PTCRB, IC, GCF
3.3 Latin America, Australia, New Zealand, Mexico
- Recommended Models: EC25-AUX / EG91-AUX / EC200A-AU
- Bands:
LTE FDD: B1/B2/B3/B4/B5/B7/B8/B28/B66
LTE TDD: B40
WCDMA: B1/B2/B4/B5/B8
GSM: B2/B3/B5/B8
- Certifications: CE, FCC, Anatel, RCM, NCC, ICASA*
3.4 Japan
- Recommended Model: EC25-J
- Bands:
LTE FDD: B1/B3/B8/B18/B19/B26
LTE TDD: B41
WCDMA: B1/B6/B8/B19
- Certifications: JATE/TELEC
- Warning: For Japan only—Don't use elsewhere.
3.5 China & India
- Recommended Models: EC20 / EC200A-CN
- Bands:
LTE FDD: B1/B3/B5/B8
LTE TDD: B34,B38,B39,B40,B41
WCDMA: B1,B5,B8
TD-SCDMA/EVDO: B34,B39 / BC0
GSM: B3,B8
- Certifications: SRRC, NAL, CCC
3.6 Global Cross-Region (US/Europe/Asia/Africa)
- Recommended Model: EG25-G (Global Full Frequency)
- Bands:
LTE-FDD: B1/B2/B3/B4/B5/B7/B8/B12/B13/B18/B19/B20/B25/B26/B28
LTE-TDD: B38,B39,B40,B41
WCDMA: B1/B2/B4/B5/B6/B8/B19
GSM: B2/B3/B5/B8
- Certifications: SRRC, NAL, CCC, GCF, CE, FCC, PTCRB, IC, ANATEL, IFETEL, KC, NCC, JATE, TELEC, RCM, NBTC, ICASA, IMDA, FAC*
- Other: WHQL
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4. Critical Parameter Decoding
Understand these to avoid wrong purchases:
4.1 Network Generation
- 2G (M26/M35): Lowest cost, but 2G sunset in many countries—only use where GSM is active.
- 4G Cat 1 (EG91): Lower power, enough for SMS/light VoIP.
- 4G Cat 4 (EC25/EG25/EC200A/EC20): High throughput, ideal for bulk SMS & VoIP.
4.2 Regional vs Global Modules
- Regional (EC25/EG91/EC200A): Optimized for one area, better signal & lower cost.
- Global (EG25-G): Works everywhere, best for cross-region business.
4.3 Device Compatibility
- Modem Series: M26/M35/EC25/EC200A/EC20
- MP SMS Gateway / GP VoIP Gateway: M26/EC25/EG91/EG25/EC20
4.4 Certifications
All modules have official carrier & regulatory certifications (CE, FCC, GCF, SRRC, RCM, etc) for legal global use.
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5. Common Misconceptions (Avoid Costly Mistakes)
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❌ “Global modules are always better”
Fact: Regional modules (EC25/EG91) have stronger local signals & lower cost—choose global only if you cross regions.
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❌ “2G modules work everywhere”
Fact: Australia, SK, Japan, USA, Canada shut down 2G—M26/M35 are banned here.
-
❌ “EC25 works globally”
Fact: EC25 has regional variants—EC25-J only for Japan, EC25-AFX only for North America.
-
❌ “EG91 same as EC25”
Fact: EG91 is Cat 1 (slower), EC25 is Cat 4 (faster)—match your traffic speed.
-
❌ “EC20 works worldwide”
Fact: EC20 is China/India only—do NOT use in other regions.
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6. Match Module to Your Exact Need
✅ For Fixed Single Region
Choose regional dedicated modules:
- Europe/ME/Africa/SE Asia: EC25-EUX / EG91-EX
- USA/Canada: EC25-AFX / EG91-NAX
- Latin America/Australia: EC25-AUX / EG91-AUX
- Japan: EC25-J
- China/India: EC20 / EC200A-CN
✅ For Cross-Region / Global Business
Choose EG25-G (global full-band, plug-and-play worldwide).
✅ For Low-Cost Basic SMS (2G Available Areas)
Choose M26/M35 (quad-band GSM).
✅ For High-Speed Bulk SMS / VoIP
Choose 4G Cat 4: EC25 / EG25 / EC200A.
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7. Final Buying Rules
- Confirm 2G status if choosing M26/M35.
- Fixed region → regional module (EC25/EG91/EC200A).
- Cross-region → EG25-G.
- Always match local carrier bands for best signal.
All modules are certified and optimized for our modems, SMS gateways (MP series) and VoIP gateways (GP series)—stable, reliable, and ready for mass deployment.
