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Oh this happened to me, it might be because your sim is still locked or not yet fully unlocked.
Mine got fixed once i wait a few days after having it unlocked.
juz normal text. i send but it gets stuck in outbox and would not go out. it did work on my other phone. but that phone cant use internet.
there's no limit to my sent messages box and outbox. my other phone sucks. and has a damage mic so i cant make calls on that phone.
i tried almost everything, including resetting factory settings but still doesnt work