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  1. J

    Help SMSC Number Change

    I have a Samsung Galaxy S4 I545 running Android 5.0.1 (Baseband version I545VRSGPL1). My carrier has been Verizon, but I recently switched to AT&T. After switching the SIM card and updating the APN, I can do MMS messages, calls, data, and receive SMS messages. However, I cannot send SMS...