No iPhone 3G, EDGE or MMS Service After iOS 4.0 Update

A number of iPhone users have reported loss of cellular data access (3G or EDGE) after the update to iOS 4.0.


Reset all settings. Try this first. On your iPhone, select Settings, then Reset, then Reset All Settings. This will result in the loss of data created since your last backup, but may solve the problem.

Restore, but not from a backup. One less-than-ideal fix for this issue involves restoring the iPhone as a new device rather than from a backup. It appears that bad holdover data from iPhone backups can cause loss of data access. Restoring as a new phone will delete contacts and other data, but generally resolves this problem.

To do so, connect your iPhone or iPod touch to your computer, click “Restore” in iTunes, then choose “setup as new phone.”

Some incidences of this issue may require a DFU restore.

Download new carrier settings. On your iPhone, go to Settings > General > About. If prompted for a carrier settings update, install it.

Otherwise, go to on your iPhone and download new carrier settings.


  1. says

    I had the same problem on stc network in KSA, I just changed the Apn settings:, but left the username and password blank.
    I hope it will work you according to your own network apn.

  2. says

    Erica in message number 13 above had an easy solution! Turn on airplane mode for a few seconds and then turn it off. Service comes right back on! Try this first before all that long drawn out stuff.
    Thanks Erica!!!!

  3. says

    I restored my iphone 3G when I shouldnt have as i live outside the UK and the US. I bought it in the UK and I live in asia. It was then on recovery mode..the one with the USB and itunes icon connecting and i could only make emergency calls. I then blackra1n it and finally it works! wifi is ok.. only problem is my sim card is invalid. how do i unlock the sim card?? it shows ‘No Service’ pleeease please help!

    • elliot says

      you have to jailbreak with redsn0w and theh get cydia and download and install ultrasnow that should fix the problem

  4. says

    Guys, thought of leaving a meaningful comment here: here is what I had: iPhone 4 OS 4.1 AT&T USA version. There are couple tricks that you will need to be aware. I didn’t know this but tried it and it actually work, my EDGE/3G internet access is now back online.
    My iPhone 4 is jailbroken with Limera1n with baseband 01.59.00 unlock using Ultrasn0w (used TinyUmbrella to update to OS 4.1 without update the baseband)
    Here we go:
    1. After your phone is jailbroken/unlock, you must take out the microsim card (very important step!!!!)
    2. Use your phone and access the Wi-Fi hotspot, use Safari and enter the following address: from your iPhone!
    3. You will be ask to create a custom APN: you must search for your service provider for APN name, user ID, and password, my network wording is all “internet”
    4. Click create the custom APN, let the system do the work, it will show up in your profile in your setting page as : APN Carrier Settings
    5. Once finish, turn off your Wi-Fi network
    6. Reinsert your non-AT&T microsim, check to make sure you still can receive your carrier signal (my crash when I left the sim in there during the APN build)
    7. Now check to see if you can access EDGE/3G
    Note: another way to see if your APN had successfully change is to go Settings/General/About — Check your Carrier name (my said AT&T before but now change to my local carrier)
    It should now work………GOOD LUCK ALL

  5. says

    I tried everything above, then I ran across iwillholla’s post about ultrasn0w. As soon as I installed it, BAM! Everything started working again!

    Thanks iwillholla!!

    iPhone 3GS v4.1

    *(No service after updating to 4.1 – fixed)*

  6. says

    Follow shanman’s advice…. It works 100%
    shanman9 said at 9:58 AM on July 3rd, 2010: Heres how I got it
    working. 1. Go to cydia and add the repo 2. Look
    for supreme preferences 3.0. Install. 3. Go into winterboard and
    check supreme preferences 3.0 4. Go to settings/supreme preferences
    3.0/applications/phone/ switch on cellular data editing. 5. Now
    your cellular data network should be displayed in the normal

  7. says

    Hi I updated my 3 GS to the latest version after months and
    months of avoiding it. I only did it thinking they had fixed the
    bugs that everyone was expierencing. But nope. After updating I had
    no carrier. But turns out someone suggested to turn airport mode on
    and then off and sure enough it worked! So thanks for that

  8. says

    i had the “No Service” issue with my iphone 3g after updating the firmware to 4.2.1… for the life of me i couldn’t figure out why my phone would lose all of the network information after i restored it from backup… then i realized i backed it up in airplane mode (which is essentially a state of “No Service”), so basically i was backing up my phone with no network information at all. the fix is really simple for this however! if you are experiencing “No Service” after updating/backing up in airplane mode, just put the phone back in airplane mode for a minute or so and when you turn airplane mode back off, all of your network information will return and viola! back in business! let me know if this works for you.

  9. says

    Bought 2, iPhone 3GS about 9 months ago. About 3 months ago, one started dropping calls. I spoke to ATT & Apple. ATT did some things to “reset the phone to the tower”, so they say. Apple did nothing. The problem began getting worse. If I’m talking on the phone and get a text, the call will drop. Always shows 3 to 4 bars in signal. Called ATT 9 times since the problem started, called Apple 3 times, and ATT also did a 3 way conference call with Apple & me, twice.

    Apple swears it is a software problem with ATT sim card, so ATT replaced the sim card. Did not help. ATT swears it is a hardware problem. Long story short, I have been paying over 100.00 for the past 3 months, but can’t make calls longer than 20 seconds. Home button also started acting up. Sometimes you have to push it very hard several times to get any reaction. And you have to push it on the right hand side of the button or it will not work.

    Apple finally gave in, because the hardware warranty is still good, and said to take it to the local Apple store for replacement, because of the home button, not because it was dropping calls. Well, Apple store in Lafayette Louisiana does not handle iPhones….hmmm there’s a kick in the teeth. Apple tells me to go to THAT store, but that store is useless when it comes to phones.

    So, I bring the phone back home, and called ATT again. This time to cancel the account. I have been a ping pong ball between Apple & ATT long enough.

    Again, they do conference call with Apple, but now Apple wants 35.00 from me to send them the phone… why?? The phone only weighs a few ounces, I can FedEx overnight for about 15.00. I refused to pay anything. It’s under warranty, and they have been shinning me on for 3 months. I told ATT that I wanted to end the conference call with Apple and proceed with canceling the contract. ATT said I had to pay a penalty for canceling early. I told them to take me to court, I refuse to pay that also, simply because I have paid over 300.00 in the last 3 months for service that I didn’t get. The phone is a great iPod, but a terrible phone during the last 3 months.

    So, then ATT steps up, and offers me a free phone upgrade, 3 months early. I was surprised, but interested. I refused their offer for another iPhone, simply because of Apple. I would never ever buy another iPhone. Not that they are all bad phones, but because support is non-exsistant, even with warrenty and Apple care. Apple has offered absolutely no support in the past 3 months. They have done nothing all the way through this nightmare, but blame ATT’s network, which is bull. I can use the other iPhone, make a call and talk for hours, hang up, call the same person with the bad phone, and the call drops within 20 seconds. I know it’s not the network. I did take ATT’s offer for the HTC 4 Inspire. My total out of pocket cost for this phone was 4.06.

    ATT waved all the fees and didn’t ask me for anything except 4.06 which was some kind of tax that they couldn’t get around.

    So, be careful spending money on Apple care…. because Apple, really doesn’t care!

  10. tshering says

    hey is it necessary to rmove d sim card before selecting the carrier at unlockit……
    i had tried it once wit my sim inside but it said unable to create profile

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