Thanks! That worked for me too. The only thing that I might have done to trigger the bad behavior was spending all day yesterday in an area with no service.

I spent a few hours in a No service area today and my phone never recovered! I tried this and it didn't work! Any other suggestions?

This worked great. I had a no service message and it appeared as though the battery was dead. After resetting I have service and the battery is showing up as charged. Thanks for the post.

Thanks for the helpful post! Ran the battery down today pretty low for it to function properly. This fixed it right away.

Be aware that if you have a Wi-Fi connection set up, the settings will be set back to the default and Wi-Fi passwords etc. will be lost.

you are effin' awesome.

God Bless you thanx!

Thanks so much for your help! I had missed so many calls and tried uninstalling my itunes because it wouldnt sync. You fixed it! Awesome!

Rather than a data reset, I did a direct reboot (described in the iphone user guide)

Press and hold both the Sleep/Wake button and
the Home button for at least ten seconds, until the Apple logo appears.

I did hard reset, but didn't work. Finally,
I had to eject the sim card and reinsert it. That did it for now.

Thanks a bunch. I couldn't figure out what was going on.

thank you so much!! good karma points for you!!

Thanks. This worked.

Thanks for posting this quick and easy solution!

Thanks a lot - I had emailed AT&T and their email back to me was that they would contact me within 2 days!! I re-set and had Phone Service again immediately.

I was running on a 1.1.4 3.9 bl and i solved my problem by reflashing the bl to 4.6 and downgrading the baseband to 04.02.13_g and installing firmware 1.1.2 ... i then unlocked using geohot method and now my phone works perfectly.

i was getting random no service about twice a day and sometimes it was for about an entire day.

I hope this will help ... sry for my english

woohoo worked for me too. Thanks a bunch!

Worked for me too! You rock!

Thank you! Much easier than talking to a phone tree.

OMG it worked!!! Thank you so much. It took all of 30 seconds to fix it!!

Ooo wee!!.. you were first hit on google :) thanks , worked like a charm

Thanks, it worked! Preciate chya.

Hi there ,i upgraded my iphone to 2.0 by total accident as i know better . I went through the correct procedure to restore it back to its unlocked status , but now i have no service , and there is no carrier tab in the settings menu ????!!!! Any suggestions , or possible solutions !!!?? Thanks very much for your time !!!!!!

No carrier tab is necessary. On the iphone, go to Settings > General> Reset (all the way at the bottom) and click Reset Network Settings.

Hi,

Just wondering did you fix your NO SERVICE problem, My phone has the same message ever since I down graded to 1.1.4...any ideas how to fix?

Joe

i have version 2.0 and fully unlocked. all works apart from no service message. this only started after 3 months of having the phone.
i restarted the phone and unlocked again but same fault!

Please Help. Im close to starting lose the will to keep it!

For those who downgraded from software 2.0 to 1.1.4.....if your phone shows no signal...it may be because you activated your phone before completing jail breaking.....if using Iliberty....(worked for me) make sure check jailbreak *DO NOT CHECK ACTIVATE* and even though you are using the at&t network check both unlock and unlock using 3.9fb...in stall all 4 apps if you want to,,,,,then do not check any utilities....(BE SURE THAT YOU HAVE NOT REGISTERED YOUR PHONE ON ITUNES....IF YOU DID YOU CAN REINSTALL ITUNES AND THAT MAY FIX THE ISSUE) the big point here is that you do not leave it up to other programs to activate your phone...if you want to be able to use your phone you must wait and activate it on itunes yourself...by activating i mean setting it up like naming it and what not....also dont reload from any backups

I sometimes work in a building that has no reception and while in there I have the "no service" message, which is fine. Everybody who works in the building with any phone has the same issue. But when I leave the building and go outside where I normally have strong signal, my phone stays non-functional with "no service" message until I remember to take steps outlined above to restore service. This is nonsense and should be fixed. I don't want to have to continually check my phone to make sure it is 'on' and I can receive calls.

Hello, I realized that I miss the option "CARRIER" in the settings menu. Can someone help??