1. AC Question's Avatar
    when i put my at&t sim card in my verizon galaxy s5 phone
    it keeps saying phone activation sim from unknown source
    04-19-2015 02:43 PM
  2. Raptor007's Avatar
    The issue may be that its SIM locked which is pretty common for Verizon & AT&T to do so you can't jump carriers without paying off the contract first. If its paid off and you are contract free, you should only need to go into the radio settings and tell it to use global settings instead of CDMA/LTE only.

    NETWORK LTE Band 13/4 (700/1700 MHz), CDMA/1xEVDO Rev. A (800/1900 MHz); Global - EDGE/GSM (850/900/1800/1900), HSPA/UMTS(850/900/1900/2100)
    04-23-2015 08:01 PM

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