I have an unlocked galaxy note 8 that I'm using through straight talk. It's been working fine for close to a year but now wont allow multimedia messages. All other mobile data seems to work fine. I've been trying to manually adjust the APN but the phone will not allow me to edit the current APN (T-Mobile's) nor can I add a new one. When I complete a new one I try to save and it just vanishes.
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