I thought that I'd add my experience with my 2-month-old iPhone 5. Inexplicably, the iPhone 5's speakers ceased to work and I got the "notification" that I was using headphones. . . which I wasn't. The phone worked just fine with my Jambox; and, when I tested the ring-tones (switching them around), the speakers on the phone worked. But, that's the only time the speakers worked.
I tried every trick recommended -- vacuumed the headset hole; blew in the headset hole; re-booted the phone; cleaned the headset hole; turned bluetooth on and off; turned silent switch on and off; pulled the headset jack in and out several times; and, generally tried any old thing that occurred to me.
I awoke at 3:30 am and started worrying about the hour-long drive to the nearest Apple store during the holiday rush; then, an Ah-Ha moment came. I needed to do the equivalent of zapping the P-RAM (younger users may need to google that). So, at 3:45 am I did a hard re-boot: I pressed the Home and the Sleep-Wake button until the phone shut down and re-started. That did it.
Reflecting now: probably a restore from a backup would accomplish the same thing.
My iPhone 5 is just about two months old and the ear speaker has begun failing.
Initially, I thought it was a problem with the other party - the other party could hear me but I could not hear anything (not low volume - NO sound whatsoever). Then I found that by placing the call on speakerphone, I could hear and have conversations.
By hitting the phone and/or adjusting the ear volume control, the sound suddenly turns on again but it is inconsistant and doesn't always fail or work again after failure.
Bottom line is that there is a problem. Can someone tell me what Apple's policy is on this? My phone was purchased through my provider.
I cannot speak for everyone in this thread but my iPhone 5 64GB blk phone (on TELUS network) began exhibiting this same problem about 1 1/2 months after purchase. At first, it was an intermittent problem, which I erroneously thought was the fault of the other party. The only way to continue a conversation was by connecting the ear phones or placing the phone in speaker mode.
This is absolutely a hardware problem because I soon discovered that tapping the back of the phone (behind the ear speaker) would temporarily cause the speaker to work (with a little static on occasion - clearly a loose connection).
Two days ago, Apple 'Genius Bar' were convinced that the repair was simply a Receiver module (part # 923 - 00210), even though I explained that it was more likely a loose connection. Yes, the ear speaker was working again immediately after the repair but sure enough, the next day, it began failing again!
I can't speak for others but I think there is a common thread with poor electrical connection on the ear speaker.
Confirmed: Turing off Bluetooth fixes this problem.
I recently received a replacement iPhone 5 from App (the flash died on the original one).
A few days after upgrading to iOS 7 the speaker in the earpiece started playing up where it wouldnt work for a couple days then would randomly start working again. Loudspeaker works fine.
Tried turning Bluetooth off as suggested here and it works fine now.
This is a software bug which hopefully Apple will realease a fix for soon.