Most phones control in call volume with a designated volume button on the side of the phone or with the directional pad on the front. With most standard phones in call volume can only be accessed while actually on a call, this means that if you push the volume up button while talking to someone your volume will increase. If it is a smart phone you can generally access in call volume from the settings menu under sound or something like that. If none of this helps it may be a speaker fault.
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