It's not just Sprint, but since their network is weaker than others, the issue stands out more. There is a reception issue with the device. Seems the better the network, the less the issue stands out. This appears why Tmo customers seems second, ATT third, and not much from Verizon, unless in a fringe area. Seems Samsung might have messed up on thr antenna design. Maybe.
I know the dev, you can level ur site notes or join s4gru and have the database already made.I like this one too: https://play.google.com/store/apps/details?id=com.blueline.signalchecklite
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