IPhone keypad not working during call?

Well I just got a iPhone a day before Christmas and I'm on three way, and my keypad won't work. Like in a situation where it's like "press one for yes" ill press one but it won't respond. What do I do?

Then try switching of your mobile. Or just give it to the mechanic for reparing

Make sure you're updated to the latest software from Apple. (iOS 7.0.4). Meanwhile, try simple things like turning your phone off and on again. If still, try restoring your iPhone, just make sure you back up to either iCloud or iTunes. If still, take it into Apple and see what they say. It might just be a software bug, or a one time glitch, might not happen on your next call.

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