GSM repeater & signal booster extends 2G/3G/4G cellular coverage in your house or building

If your WiFi router range does not cover some of your rooms what do you do? You install a WiFi repeater or some of the more recent WiFi mesh networking solutions. What I did not know is that you can do something similar for cellular connectivity if you don’t quite get a reliable signal from your telco’s base station.

Specifically, I’ve just come across a 900 MHz GSM repeater & signal booster that claims to be able to extend the 2G, 3G, and 4G cellular signal in a 100 to 300 m2 area, and sold for $59 on Banggood.

900 Mhz GSM Repeater

Here are the specifications listed for the GSM repeater:

  • Operating Frequency Band – GSM
    • Uplink: 890-915Mhz
    • Downlink: 935-960Mhz
    • Gain: 70dbm
  • Outdoor Directional Antenna Gain – 8dB
  • Compatible with 2G / 3G / 4G cell phone signal
  • Power Supply – 12V DC via 110-240V DC adapter
  • Dimensions – 135 x 105 x 23 mm (Aluminum Alloy)
  • Temperature Range – -10 to 60°C

900 MHz corresponds to the B8 LTE band, so it’s not only for 2G GSM as I first assumed. You’d better check out if your country supports 900 MHz for 2G, 3G and/or 4G, and may also want to double-check whether such signal booster does not break any local regulations. The kit comes with the repeater itself, an indoor antenna, a high-gain outdoor antenna, and a power supply.

GSM Repeater Installation

The installation looks quite easy, and the hardest part is probably to attach the outdoor antenna on a wall or roof and make sure it points to the closest base station. One way to check your frequency and/or base station location is with Network Cell Info Lite Android app.

If you’d prefer supporting more frequencies or a different frequency you’ll find various GSM repeaters on Aliexpress or Amazon US at various prices and some are tri-band repeaters with 900, 1800, and 2100 frequencies selling for around $100. While I did not personally know about those, cellular repeaters have been around for several years, and people who purchased those look to be satisfied in general.

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