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Well, I have a iPhone 4 that signed up to Sprint, and I've had this for 5 months and nothing happened. Now my iPhone is not sending text messages or sending calls. Even when my Sprint signal is high, it doesn't seem for the text messages to go through or heck not even the calling. Only when my iPhone is in Extended "Roaming" it could send texts and calls. Is there any suggestions into solving this issue? Or do I need to replace this iPhone? I tried turning it off and on (didn't work), and Restoring the iPhone (still didn't work).
please I need help on solving this problem.

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