yesterday, i was on the phone with my friend for about ten minutes, and everything before that was fine, then after i hung up in the afternoon, i continued my normal everyday activities, and an hour later, i was going to make a phone call, and when i picked up, there was no dial tone, but i could press the buttons and hear the usual beep sound, i can't call out or receive any calls. does anyone have any idea what's wrong and how to fix it? i'd greatly appreciate any help. thanks
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