other people cannot hear me from my iphone because the sound is too small. Microphone has a problem.
Iphone input sound is too small. Other people cannot hear me from my iphone.
Question marked as
Have Apple repair it. It will cost about 2/3 cost of a new phone
Before arranging for a repair or visit to a genius bar, first try a Forced restart
Click here > Force restart iPhone – Apple Support (UK)
If no better you should probably arrange a repair
Click here > iPhone Repair & Service - Apple Support
Or Click here > Contact - Official Apple Support
Anything other than Screen or Battery may be a replacement phone and the price is in the article under "Other damage"
See also: Get your iPhone, iPad, or iPod touch ready for service - Apple Support