I recently bought a new Iphone 4 but have experienced a problem with very low call volume, I can not hear the other person on the line at all if there is any background noise. I have removed all packaging including the plastic film so this cannot be the problem as it has been in some cases. I was able to have a hour long phone call to begin with and everything worked well and after this the volume just dropped.
I have fiddled with the in-call volume buttons but it seems to make little difference.
Thanks for any help, I'm sure there is something really silly that I'm not doing to fix it.
Other places here sugest looking for an obstruction ... I had my cover screen replaced ... removed the film ... but didn't notice there was a tiny piece a few mm. still over the speaker ... removing it worked ...