1. Rafagon's Avatar
    Also, what is the Validity Period right below that?

    Alcatel Fierce 4 running Android 6.0.1.
    Attached Thumbnails What is SMS Service Center and why is it grayed out on my phone?-screenshot_20170425-211733.jpg  
    04-25-2017 08:48 PM
  2. B. Diddy's Avatar
    I believe the SMS Service Center number is the number your phone uses to send and receive SMS: SMS Tutorial: What is an SMS Center / SMSC? SMSC's Duty in a Wireless Network System

    It's not something you should mess with, because if it's wrong, the phone would stop receiving SMS. So I would guess that either the system prevents you from changing it, or perhaps the carrier.
    Rafagon likes this.
    04-26-2017 12:49 PM

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