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??

Please Please help, my 2G iphone unlocked with QuickPwn has no service! I have located the problem which is in SETTINGS > PHONE > CALL FORWARDING > although the call forwarding is set to OFF it says there is an error, thus resulting in no service! I have tried to restore and unlock again, and have tried different sim cards with no luck. Does anyone know how I can solve this issue?
Many thanks, any help would be grateful

I had this problem today and boy!, it is frustrating. I browsed through Apple support and bunch of other forums before I figured out a 'workable' solution.

I feel this error has got lot to do with ATT than Apple. Apparently, ATT's 3G network is not the best and the signal keeps wavering. Sometimes it goes completely off. Ideally, when iPhone is tuned to 'Enable 3G', it should automatically pick up 'Edge' in the absence of 3G - which it does most of the time. But sometimes, the phone crashes and displays 'No Service'. And here is what worked for me.

I disabled 3G. The phone was working fine with 'E' network. I made couple of calls just to validate the connection. And after that, I went into settings and enabled 3G again. I had a 'No Service' briefly and the phone picked up 'E' network, indicating 3G signal was low or not existing at the moment.

Hopefully, the phone will pick up 3G when it is available.

Worked for me too on a brand new iPhone 3G - software 2.2. Got bored waiting for ATT tech support and found this page the same way everyone else did. The only downside is that it loses the WAP password for my WIFI, which is a tedious pain to re-type.

I would see the No Service status along with E or sometimes 3G, no voice calls but data still worked!

HELP! ive got an iphone with no service problem,i restart my phone while waiting for signal to fully respond i call any number and it was successful(for 6 minutes) but if i will end the call the signal starts to crash.now im starting to lose confidence on apples product.

Didn't work for me.. the Apple company didn't help me to resolve it either.

Thanks man!! worked for me.....you are the one......!!!

Man, AT&T and/or the iPhone are hokey. I had Virgin Mobile and a $20 phone (basically as cheap as you can get for phone or carrier), and never once had any problems whatsoever with service. Now because I ride the train every day to work and go through tunnels, I constantly have to restart the phone because it BS's itself into thinking it doesn't have service. Can't they be smart enough to have it automatically re-check or something? Seems this definitely should be fixed in a firmware update, it's complete BS to have this crap going on with a $300 phone and a $75 / month service fee. Insane.

Scratch my above post. Turns out that even just when I'm sitting in the office the phone will go to no service. After I swear profusely at someone for selling me a defective phone that costs $300, I'm getting a replacement.

You guys are amazing! Thanks for sharing the solutions! Unfortunately resetting my network settings didn't work, but turning off 3G did the trick! Thanks!

tried ur instruction, but mine is the 'waiting for activation' messAge.

Genius.

Resetting the network worked for me! Thanks!

mine doesn't work...still show no service...need help

Awesome Worked for me to. I noticed my Edge icon is a circle now for some reason, Does anyone know the reason for this?

Legend! Thank you so much!

Resetting my phone did not work but turning off the 3G and restarting the phone worked like a charm. Thank you!!

THANK YOU!

Turning off 3G and restarting the phone worked for me also. Thanks, Lindsey, for the hint. (I tried the network reset first, but it didn't solve the problem).

Running iPhone OS version 2.2.1 on a 3G phone.

Before resetting network settings (and lose all your settings) try this:
go to settings - general-network: disable 3G and then reset Iphone
I tried all other recommendations only this one worked

You are my hero!! I have only had my iPhone for 1 week and was distraught - your instructions worked like magic!! Thanks so much :-)

i install the 2.2.1 version on my phone and now i have no service.
can someone help me?

i did tried anything, turning off 3G connection, resetting network, restart iphone, set the carriers to auotmatic, anything. but still no service, kinda frustrating now. can anyone help?

Pure Awesomeness!!! Thanks a million

I turned off 3G, restarted and turned it back on. This worked, but then it happened again to me later.

I'll try the network settings reset next time it happens and see if that fixes it for good???

Thank you!! It worked for me, too!

Thanx soooo much!!

i had to reset the network 2 times, but worked also for me:
FFM, Germany, Simyo (eplus network).
thanks!

You might find some useful tips here http://diepgangnl.blogspot.com/ as well

I tried troubleshooting all the different ways i could find by people online. What worked for me is to restore the phone to the original settings. Sometimes the apps can be the issue. It may end up being a bad download. When you restore the phone I suggest putting a couple apps back on a day at a time. Then you can narrow down what the problem app may be. At that point delete it from itunes and redownload it from the app store (don't worry you don't have to pay again.) Hope this works for some others.

THANK YOU A TRILLION. THIS SAVED ME!!!!!!!!! SAVED MY SANITY AS WELL.

hey guys i tried all of the ideas you said but my phone still continually will not get service.. it sometimes gets a minimal amount if i leave it in the one place for a while.. which becomes pretty frustrating.. but i was wondering does anybody have any ideas about what i should do??

Time to call apple support?

Hi All

I have an Iphone 1.1 and we have unlocked this and i had used this for 4 months it worked fine and all of a sudden i am facing NO SERVICE issue there is no network all others are woking fine.
I tried in resetting network and phone but no use can someone help me in this.

Great! worked for me.
iPhone 3G (2.2), 8GB

Unbelievable, this actually solved the problem!

I was experiencing no network service for the first time yesterday. I thought it was because of the part of town I was in, but 24 hours later the problem persisted. I suspected the AT&T network;

However,this was the first thing I tried and it worked.

Thanks!

Thanks for the help. Had the "No Service" message and followed your easy steps and reset my network settings. Iphone rebooted and I have a restored connection.