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A home-made booster can be done using two coffee cans. To do this, you will also need an antenna connector, pigtail antenna (specific to each phone model), a soldering iron, copper wire and pliers.
I’m very satisfied with AT4000W! It was unbearable when I couldn’t use my mobile phone. That horrible signal drove me up the wall. I live in underground room. The mobile signal was absent because there was not enough coverage.