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You should be able to do this at your carrier's website and logging in. at&t does this for all aspects of your accounts. There is a direct link under Settings>Phone>CarrierName(at&t) Services There should be a list of common quick connect numbers, and at the bottom (at least under at&t) is a quick link to the at&t mobility website's login page.

TEG
 

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from setting, you can get message about remaining minutes but not the txt message. i think you should go on website.
 
I use the Pageonce account on my iPhone. It tells you everything you need on one screen for AT&T including minutes and text left.
 
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