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if you dial *#0011# you can get it into the radio service mode which has all kind of info. The one thing I would look at first is are they both connected to the same band. I assume both of these are T-Mobile versions?? If so they both support Band 12 which is T-Mobile's low band spectrum. While it penetrates farther and carries further it is also a bit slower and is T-Mobile's secondary LTE channel so will tend to always show less bars if connected to it since if the Band 4 (2 in a few markets) signal is strong enough the phone will always roll over to the primary band. If one phone is connected to one and the other that would be one reason.
The other thing I have noticed with my S7e is that when not in use it always drops down to barely hanging on even if I know I am not that far from a tower but as soon as I do something that needs data it pops all the way up. Almost like the phone is trying to save battery until it needs it then turns up the tx power.
I have had no issues with my S7e and compared to my friends IPhone I always have more signal.
Happy Saturday, samsungdan!
Was Steve's suggestion of help to you? It does sound like one antenna may be stronger than the other. Steve also makes a good point that the two phones may be on different bands which can significantly impact signal strength.