Lumia 925 earpiece not working but speakerphone working during calls

[WPCentral Question]

My two month old 925 on 8.1 (I got 8.1 about a month ago) creates no sound through the earpiece during calls but speakerphone and headphones work fine. It started a week ago during a call where the person's voice slowly faded out in the earpiece, but putting it on speakerphone let me hear them. First I assumed it was Tmobile's almost nonexistent indoors reception, but this happened outside too. This happened again in a later call, and now I never get any sound from the earpiece. The phone has never been dropped or anything. It doesn't appear to be stuck in headphone mode, but I tried those fixes anyway and there's nothing stuck in the jack. A soft reset did nothing as well.

A possibly related issue is that, since updating to 8.1, sometimes my phone randomly says I have no SIM card so I have to restart it.

Can I return this device if I have to even if it's on 8.1? Would that void the warranty?
Thanks

 

[hopmedic]

First, yes, your warranty should cover you.
http://forums.windowscentral.com/wi...1-warranty-does-pdp-void-lets-get-bottom.html

Second, before you think about taking the phone in for replacement, you should perform a factory reset to be sure that it isn't a software problem. Go to settings | about | reset my phone | yes | yes. Make sure you back up pictures and any other data you need to keep that isn't already synced before you do so.

Odds are that this is a hardware problem, so the reset won't make a difference, but a reset is one of the steps they should make you do before replacing anyway, so you can save yourself some time on the phone by doing it ahead of time.