This is a response from " brought over from the other thread
so that we can keep the answers together in one related thread.
https://groups.google.com/forum/#!topic/misc.phone.mobile.iphone/aLtBm7k2UO0
*****

OK - on the off-chance that you are actually serious about your question,
and yet have no capacity for internal thought or logic, a condition proven
repeatedly.

a) The repeater *does* report back to the tower, just as your cell-phone.
How do you think cell-calls are traced? This is not just 'movie' stuff, but
everyday stuff. Not just cell phones, but your car, your FitBit and much
more. The point of this device is that you are in a poor coverage area.
Otherwise, you would not need it. Meaning, it acts as an amped-up link for
your phone.

b) Therefore, the moment you moved this device onto another tower, your
provider would know it. They live for jackasses, cretins, donkeys and
assorted other detritus - such as you - who somehow feel that agreements
made in good faith are to be ignored for their personal benefit. Let me put
it another way - if you can figure out an angle to cheat, they have entire
staffs dedicated to thwarting idiots like you.

You really do need to get a life - and/or invest in learning about critical
thinking as you are, clearly, a tick on the soft underbelly of society in
your present state.