Cellular Signal Repeater Bands 1, 3, 5 Improve Both Voice and Data

A cell phone repeater (also known as cellular repeater, amplifier, or cell signal booster) is a device used to improve cell phone reception in an indoor outdoor environment. A cell phone repeater is typically made up of three primary components:

• An outside antenna - also called a "reception" antenna
• A signal amplifier
• One or more rebroadcast antennas

It's a solution that takes an existing outside cell signal, amplifies it, and then broadcasts the boosted signal to an area inside of a building or vehicle that needs better signal. 

A cell phone signal booster requires an existing outside cell signal to boost. It cannot create it's own cellular signal, so if there is not an existing outside cell signal available, then a cell phone signal booster will not work.

The frequency used in different countries or regions is different, if the frequencies used there are different than those boosted by this equipment, it will not work.

So please check first what frequency your carrier is using.Here's how to check the frequency. 

iPhone

1.Turn off Wifi

2.Key in *3001#12345#*

3.Press call

4.Tap: menu

5.Tap:Serving Cell Info

6. Scroll down to freq_band_ind

Android

Install an app Network Cell Info Lite on the Google Play store. It provides detailed network cellular information.