Carrier guide

Network compatibility SFR

SFR, a subsidiary of Altice France, is the second-largest mobile operator in France. Born from the merger with Numericable, SFR also owns the country's largest cable/fibre network. This guide details the 4G/5G frequency bands used by SFR to help you verify your phone's compatibility.

Updated March 2026 · ~5 min read

SFR France frequency bands

SFR deploys a range of LTE bands similar to Orange, supplemented by 5G on band n78. The SFR network also benefits from the Numericable fibre heritage for site backhaul.

Technology	Band	Frequency	Primary use
4G LTE	B1	2100 MHz	Urban coverage
4G LTE	B3	1800 MHz	Primary band, extended coverage
4G LTE	B7	2600 MHz	High capacity, dense areas
4G LTE	B20	800 MHz	Rural and indoor coverage
4G LTE	B28	700 MHz	Extended coverage, penetration
5G NR	n78	3500 MHz	Primary 5G, high throughput

SFR also retains 2G (900/1800 MHz) and 3G (900/2100 MHz) spectrum, with a 2G shutdown target announced for 2025-2026.

How to check your phone's compatibility

Find your IMEI

Dial *#06# on your phone. The first 8 digits form the TAC that identifies your model.

Look up supported bands

Enter your IMEI or TAC in our TAC Lookup tool to get the list of frequency bands supported by your device.

Compare with SFR bands

Your device should support at minimum B3 + B20 for proper 4G coverage on SFR. For 5G, band n78 is required.

Compatible smartphones for SFR (4G + 5G)

These devices support all 4G and 5G bands used by SFR France:

Samsung Galaxy S24 Ultra

B1/B3/B7/B20/B28 + n78 · Snapdragon 8 Gen 3

Apple iPhone 15 Pro Max

B1/B3/B7/B20/B28 + n78 · A17 Pro

Google Pixel 8 Pro

B1/B3/B7/B20/B28 + n78 · Tensor G3

Samsung Galaxy A55

B1/B3/B7/B20/B28 + n78 · Exynos 1480

Xiaomi 14 Ultra

B1/B3/B7/B20/B28 + n78 · Snapdragon 8 Gen 3

Nothing Phone (2)

B1/B3/B7/B20/B28 + n78 · Snapdragon 8+ Gen 1

SFR network specifics

VoLTE & VoWiFi

SFR offers VoLTE and VoWiFi on certified handsets. VoWiFi is particularly useful for SFR subscribers living in mobile dead zones but covered by fibre/ADSL.

RED by SFR = same network

RED by SFR uses strictly the same network as SFR. No difference in coverage, bands or network priority. The distinction is purely pricing and commercial.

5G SA in preparation

SFR has announced a roadmap toward 5G Standalone enabling network slicing, reduced latency and new industrial use cases. Deployment is proceeding gradually across the core network.

Numericable heritage

The 2014 merger with Numericable gave SFR a unique advantage: a dense fibre/cable network for mobile site backhaul, improving 4G and 5G site throughput.

Frequently asked questions. SFR

What 4G bands does SFR use?

SFR uses five LTE bands in France: B1 (2100 MHz), B3 (1800 MHz), B7 (2600 MHz), B20 (800 MHz) and B28 (700 MHz). Band B28 was deployed more recently to extend rural coverage.

Does SFR offer 5G Standalone?

SFR has announced its roadmap toward 5G SA (Standalone) deployment. As of 2026, most SFR 5G remains NSA (Non-Standalone), using band n78 (3500 MHz) anchored on the 4G core network.

What is the difference between SFR and RED by SFR for network?

SFR and RED by SFR use exactly the same physical network, same antennas, same frequency bands, same coverage. The difference is purely commercial: RED is SFR's low-cost, no-commitment brand.

Is VoLTE available on SFR?

Yes, SFR has deployed VoLTE and VoWiFi across its network. These features require a compatible and SFR-certified handset. VoWiFi is particularly useful for making calls via WiFi in areas without mobile coverage.

Will my foreign phone work on SFR?

It will work on 4G if it supports at minimum B3 and B20. Models sold in the US or Asia sometimes lack band B20 (800 MHz), which is essential for indoor coverage in France.