My phone number in the 'About' section is settings doesnt match my phone number

al54321

    The about page in settings shows my temporary number. It has been 3 months since i ported over to T Mobile, and it has not changed. It is affecting my MMS messages - since that time - my phone adds my phone number to a group message, since it doesn't recognize it as me. T mobile wants to do a hard reset on my phone and is saying it is a Samsung issue... It seems like i need an air update or something, it seems a number issue.

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