3 Verizon s7 edge phones have had the same problem with mobile network connection fading out completely and then is reset by switching from global to cdma and then back to global. The problem is at home and away.
3-4-5 weeks and the phone will loose mobile network connection (bars) and have to be reset.
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You can call your service provider and request a (PRN) update for the phone\phones. These are codes in the phone that tell it which towers to use. So, you will need to let them know where these phones will be used (city,state. Maybe zip.) This if that doesn't solve the problem. I can only speculate that weekly visits to there office with the compliant (untile they trade out phones) is your only other course of action. Short of rooting it. Hope this helps. For a much more in depth understanding of PRN's. You can visit xda developers dot com
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