When I connect the brand new headphones that came with my iphone 5, it only plays out of one side. When i connect it using bluetooth in my car it only plays out of one speaker. i also have a usb port and regular headphone jack in my car and when my iphone is connected by one of those methods it still only plays out of one speaker. i have tried 2 different iphone 5 that were my friends and both of theirs played out of both speakers so it must me something wrong on just my phone. Is there some setting i do not have right? is there something wrong with the phone itself?
The iPhone itself only has one speaker but by default it should play out of both speakers when using external devices - there is no setting involved - so it sounds like you might have a hardware issue - if a hard reset doesn't help then I would contact Apple Support directly and see what they say - go to this link - http://www.apple.com/support/contact/