Popular FAQs of Cellular Signal Booster | ATNJ
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The trendy topics you might want to know.

1How to know what GSM bands are supported in your country?
GSM 900 / GSM 1800 MHz are used in most parts of the world: Europe, Asia, Australia, Middle East, Africa.
GSM 850 / GSM 1900 MHz are used in the United States, Canada, Mexico and most countries of S. America.
2Can your signal booster cover all carriers and all networks?
Our cell phone signal booster works with all carriers and all networks. Besides we have tri-band, quad-band, five-band signal boosters. Please tell us your country and the carrier.
3Do I need to pay any monthly subscription fee for the booster?
No, not any extra fee required.
4Do your booster have any safeguards for the prevention of cell tower interference?
Each of our signal booster has built-in AGC and ALC that will automatically adjust gain and level within the base station protection standard.
5How to test the signal strength after installation, by bars or by dbm?
It’s more accurate to judge by dbm that could be checked as follows. After that, the signal strength will be shown at the top left corner of your phone screen immediately.
For iPhone users: Dial *3001#12345#*
For Android phone users: Dial *#*#4636#*#*
If judge by bar, it could be imprecise. It might show full bar but actually not the case. For it could be self-oscillation.
6What is the average allowable system gain of your booster?
It’s around 70dB, and highest up to 80dB.
7How many phones can be simultaneously supported by your booster?
No limits for phones as long as there is volume in base station.
8What makes ATNJ so different from other signal boosters?
We concentrate on cellular signal booster that is our only product. In addition, we are the exclusive partner of China carriers which proves our capability and quality from all aspects.
9How long will it take to get my booster?
Generally 1-2 days delivery, while one week for bulk order.
10Do you ship to my country?
We deliver all over the world.