No sound on 4s when making calls


Standard Member
I've had my 4s a couple of weeks now and from day 1 I've had this problem.
The problem being that every now and then when I make a call, although the call is made there is no ringing sound and when the person I'm calling answers neither they nor me can hear anything.
It happenened 3 times today which is the most it has ever happened, most days go by and there are no issues.
Do you think I've got a dud 4s?
Will apple replace this phone if I explain the problem to them?
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