Iphone volume is really quiet whilst talking on the phone?

I've just had a replacement iphone 4 which i've restored from back up but when talking on the phone i can hardly hear the other person it's fine if it's on speaker & music & ring tones etc are fine it's just when i'm on the phone is there a way to increase the volume?

If you have. Screen protector on it will mute it

Simply adjust the volume by pressing the volume button with the + sign.

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