What Frequency Bands Work for IoT Devices in China? A Complete Guide for 2025
IoT devices entering the Chinese market must operate on one of six primary frequency bands allocated by the Ministry of Industry and Information Technology (MIIT, 工业和信息化部, gōngyè hé xìnxīhuà bù), covering both licensed cellular IoT (NB-IoT, LTE-M) and unlicensed short-range radio. Failure to match these bands risks signal failure or confiscation — in 2024, over 1,200 non-compliant IoT units were blocked at Chinese ports, costing importers an average of ¥35,000 per incident in rework and penalties.
What Licensed Frequency Bands Are Available for IoT in China?
China’s three major carriers — China Mobile, China Telecom, and China Unicom — each operate Narrowband IoT (NB-IoT, 窄带物联网, zhǎi dài wùlián wǎng) on specific licensed spectrum. MIIT has also reserved spectrum for LTE-M (LTE Cat-M1) in a subset of these bands, though NB-IoT remains the dominant licensed IoT technology with over 1.4 billion connected devices as of Q1 2025.
- China Mobile NB-IoT: Primarily Band 8 (900 MHz) with 2 × 10 MHz blocks. Some regions also use Band 5 (850 MHz) for rural coverage.
- China Telecom NB-IoT: Band 5 (850 MHz) as the primary band, with Band 1 (2100 MHz) used in dense urban areas for capacity offload.
- China Unicom NB-IoT: Band 3 (1800 MHz) as the main band, plus Band 1 (2100 MHz) in high-traffic zones.
- LTE-M (Cat-M1): Available on Band 8 (900 MHz) for China Mobile and Band 5 (850 MHz) for China Telecom, but coverage is still limited — only 18% of base stations support LTE-M as of early 2025, versus 94% for NB-IoT.
Licensed bands guarantee interference-free operation and carrier-grade security, but require device certification (SRRC, 型号核准, xínghào hézhǔn) and carrier approval — a process that typically takes 12–16 weeks and costs ¥45,000–¥80,000 per model.
What Unlicensed (ISM) Bands Can IoT Devices Use in China?
For short-range IoT applications — smart home, wearables, sensor networks — China’s ISM (Industrial, Scientific, Medical) bands offer a faster, cheaper path to market. MIIT Regulation No. 55 (2019) defines the following unlicensed bands for IoT devices:
- 470–510 MHz: Reserved for short-range radio (SRD, 短距离无线电, duǎn jùlí wúxiàndiàn), including LoRa, Sigfox, and proprietary sub-GHz protocols. Maximum transmit power is 50 mW ERP.
- 779–787 MHz: Allocated for SRD use, but shared with China’s digital radio broadcasting — devices must avoid interference above 783 MHz. Maximum power is 10 mW ERP.
- 2.4000–2.4835 GHz: The global 2.4 GHz ISM band, widely used for Wi-Fi, Bluetooth, Zigbee, and Thread. Maximum EIRP is 20 dBm (100 mW) for typical devices, with higher limits for point-to-point links.
- 5.725–5.850 GHz: The 5.8 GHz ISM band, used for Wi-Fi 6/6E and some industrial IoT links. Maximum EIRP is 30 dBm under indoor conditions.
- 24.00–24.25 GHz: Recently opened (2023) for 60 GHz-like short-range sensing and data links, but very few consumer devices currently use this band.
Devices using unlicensed bands still require SRRC type approval (¥15,000–¥25,000 per model, 4–6 weeks) and must not exceed the power limits or cause interference to licensed services. Between 2021 and 2024, MIIT revoked certification for 14 imported IoT products that violated these rules.
| Band | Type | Primary Use | Max Power | Approval Needed | Device Penetration (2025) |
|---|---|---|---|---|---|
| Band 5 (850 MHz) | Licensed | NB-IoT, LTE-M (China Telecom) | 23 dBm (standard UE) | SRRC + Carrier | 38% of cellular IoT |
| Band 8 (900 MHz) | Licensed | NB-IoT, LTE-M (China Mobile) | 23 dBm | SRRC + Carrier | 41% of cellular IoT |
| Band 3 (1800 MHz) | Licensed | NB-IoT (China Unicom) | 23 dBm | SRRC + Carrier | 12% of cellular IoT |
| 470–510 MHz | Unlicensed | LoRa, SRD sub-GHz | 50 mW ERP | SRRC only | 9% of short-range IoT |
| 2.4 GHz ISM | Unlicensed | Wi-Fi, BLE, Zigbee | 20 dBm EIRP | SRRC only | 67% of short-range IoT |
| 5.8 GHz ISM | Unlicensed | Wi-Fi 6/6E, industrial | 30 dBm EIRP (indoor) | SRRC only | 23% of short-range IoT |
How Do NB-IoT and LTE-M Spectrum Allocations Differ in China?
While both are 3GPP standardized cellular IoT technologies, NB-IoT and LTE-M operate on different spectrum strategies in China. NB-IoT uses a 200 kHz carrier within licensed LTE bands — China Mobile’s 900 MHz deployment occupies just 2 × 10 MHz of its total 2 × 30 MHz Band 8 allocation, leaving room for GSM and LTE. LTE-M requires a full 1.4 MHz channel per carrier, making it more spectrum-intensive. Consequently, MIIT has only allocated LTE-M in bands where carriers have surplus capacity — primarily Band 8 for China Mobile and Band 5 for China Telecom. China Unicom has not deployed LTE-M at all due to its narrower 1800 MHz holdings.
The practical impact: NB-IoT modules (e.g., BC95, BC35) cost ¥22–¥35 each in volume, while LTE-M modules (e.g., BG96, BG95) run ¥55–¥90 each — a 60–70% premium. NB-IoT also offers slightly better coverage in basements and underground parking, with a 20 dB link budget advantage over LTE-M in rural environments.
If your IoT application involves massive sensor deployment (1,000+ units) in urban or suburban areas, choose NB-IoT for cost-effectiveness and guaranteed connectivity. If your application requires mobility, high data throughput (500 kbps+), or voice over LTE (e.g., smart wearables with call functions), choose LTE-M despite the higher module cost.
What Compliance Testing Is Required for IoT Devices Using These Bands?
All IoT devices sold or operated in China must pass SRRC (State Radio Regulatory Commission, 国家无线电管理机构, guójiā wúxiàndiàn guǎnlǐ jīgòu) type approval regardless of frequency band. Additional carrier certification is needed for licensed (NB-IoT/LTE-M) devices. The testing covers:
- Frequency accuracy: Must stay within ±0.1 ppm of the assigned channel for licensed bands, ±10 ppm for unlicensed ISM bands.
- Spurious emissions: Below −36 dBm in restricted bands, −30 dBm elsewhere to protect adjacent services.
- Power limits: Hard ceilings per band — exceeding by even 1 dBm can result in rejection.
- Interference avoidance: For unlicensed bands, devices must implement listen-before-talk (LBT) or duty-cycle limits per MIIT guidelines.
Testing is conducted at MIIT-accredited labs such as China Telecommunication Technology Labs (CTTL) or Beijing TIRT. A full certification cycle for a Wi-Fi + BLE smart home device costs ¥18,000–¥28,000 and takes 5–7 working days for RF testing alone, plus 2–3 weeks for document review. Since 2023, MIIT also requires a local agent (in-country representative) for foreign applicants — a service that many third-party test houses offer for ¥3,000–¥6,000 per certification.
NEXT STEPS: How to Ensure Your IoT Device Has the Right Frequency Bands for China
- Audit your device’s band list against MIIT’s approved bands. Download the current MIIT Frequency Allocation Table (2024 edition) and compare with your module’s datasheet. For help, see our IoT Band Compatibility Checklist — a free spreadsheet with all authorized bands, power limits, and carrier affiliations.
- Engage a China-based spectrum pre-scan lab before going to full SRRC. Early detection of band mismatches saves ¥20,000–¥40,000 per product. Our partner CTTL offers a pre-scan service read about in our SRRC Testing & Approval Guide, typically completed in 3 days for ¥5,800.
- If your device uses an unlicensed band (2.4 GHz, 5.8 GHz, or 470–510 MHz), file SRRC with a local agent now. Average approval time is 5.7 weeks as of 2025. Start early — our IoT Certification Timeline Planner helps you map out SRRC, carrier, and testing deadlines across your product roadmap.
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