It seems to me there is nothing bad for a kid to have a cell phone and when parents have an opportunity to call them. But in my case there’s a bad signal in the forest, where the summer camp is situated and it really makes me nuts. When I want to call my kids I can't do it because of problems with cellular network.
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.