iPhone 5 not receiving calls or voicemail

What troubleshooting have you tried? First thing is to power off/on, then a reset, then a restore, first from a backup and if necessary as a new device. The reset is accomplished by holding the sleep/wake and home buttons together until you see the Apple logo and then release.

Another thing might be to re-seat the SIM card, and you can make contact with AT&T and have them check the provisioning on your account. Make sure it is set up for LTE, since you have the iPhone 5. Are you noticing any trouble with signal during this time, where the phone may be losing LTE signal and searching to get signal back?

You should try to reset the Network Settings (Settings>General>Reset>Reset Network Settings).

Sometimes these settings do not carry over on a restore from an old phone to a new one.

Call yourself from another phone to test; leave yourself a voicemail, as well.

You will lose any stored passwords for secure WiFi networks, but this might help.

You can remove the SIM card and wipe it off and reinsert it. Check the manual for that information http://manuals.info.apple.com/en_US/iphone_user_guide.pdf. If that doesn't help, then try the Network settings mentioned by Shawn, then you can try the restore. If you are backing up to the cloud, or doing a backup to the computer, you can still try restoring as a new device to see if it works alright before restoring your backup.

I have the same problem, iphone 5 with At&t. were you able to fix this problem?

Thanks

Did you solve this? My wife and I both have this issue and it seems to only be a problem when we are home in the wifi mode. Turn wifi off and both iPhone 5 phones work fine. Both are on iOs 6.01. Both At&T. Same issue...no call, no voicemail.

I'm having the same problem. What appears to be happening, in my case anyway, is that the phone gets "stuck" on LTE and won't fall back to the AT&T 3G network for legacy services such as voice calls and SMS (which I think also includes voicemail notifications).

My phone has gotten thoroughly wedged a number of times that I've noticed. The phone may show WiFi if I'm home, but turning off WiFi shows it's really on the LTE network. Incoming calls go to voicemail after a few rings, voicemail notifications don't arrive and incoming or outgoing SMS messages fail.

I can fix the whole mess by simply turning off LTE in settings (no reboot or network reset or any of the other foolishness that AT&T support would have me do). I've done this experiment several times, each with the same result. Starting with a wedged phone with the behavior described above I turn off LTE in settings and the phone immediately startes working fine.

It sure smells like a firmware bug to me. But AT&T seems to be leaning towards givine me a replacement phone, wich I predict will not accomplish much.

I would have to agree with columbrian on this. I have been experiencing this issue intermittently. When I do finally receive text and phone call notifications, is on the 4g network, not LTE. As soon as everything is up to date, it reconnects to LTE. This all only happens after being in an LTE area and connected to Wifi for several hours. This is definitely an iOS firmware issue, not network or data issue. I have had the sim card replaced as well as changing my number (unrelated). I have 3 other lines on my account, 2 of which are iphone 4s, and the other is a samsung note and they all have no issues communicating with each other or others.

Same problem here though I haven't noticed if it's LTE v 4G etc. I already had the SIM card replaced and thought all was well until several people mentioned all calls went to voicemail. It's utter frustrating especially because I KNOW I have signal.

If you are having the problems with not getting calls in Wifi mode, try a new router. We actually changed our router to a CISCO after the Netgear said there was a problem with iPhones in wifi with some of their routers and they were working the issue. Whether it was the new router, or the Apple upgrade, I don't know...but it works now.

Thanks for the insight. Although I'd like to understand better the correlation between phone calls and wifi. Wifi is related to data, not cellular service right? Not disputing your point, but I'd rather not buy a new router router as they aren't cheap. Thanks!

I'm having the same issue. Sometimes it's over WIFI other times it's random. Iphone 5 no other issues until recently on ATT.

I'm having a similar issue, though for me it doesn't matter if wifi is on or not. It's happened to me while at home on wifi and while out and about in a grocery store parking lot without wifi. I haven't noticed if it varies with 4G or LTE but I know the wifi doesn't affect mine.

I'm on Verizon and absolutely frustrated but I really am starting to think this is an iOS issue, since they've replaced my phone already and it's still doing it.

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