You may need to check your volume under settings to be sure the sound hasn't been muted.
To fix an iPhone 4 with no sound, simply reset the phone, reboot, or jail break it if all fails, because the problem is software-based.
no
You get a new phone.
take it to a phone fixing store
Most of the time the phone company you have the phone through offers a service that fixes your phone. If not nokia has a website and can send you a an address in which to fix your broken phone.
get a new phone
fix the vent fix the vent
Try taking it to a phone shop, and tell them that you have network problems, but i doubt you can fix it at home :-)
fix it.
Phone, phono phon all = sound/voice
tell the phone company and they will fix it
Take it were you got it from and they will replace it or THEY WILL TRY AND FIX IT IF IT IS FIXABLE