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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.
The signal in our office used to be rather unstable. And our carrier could not help us. So we decided not to waste time and to resolve the problem on our own by getting a mobile repeater. The obtained results exceeded our expectations. I send you a few images for your reference.