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Discuss Unlocked 3GS "No Service" at random at the iPhone 3GS - Hackint0sh.org; iPhone 3GS iOS 4.0 Baseband 05.11.07 Jailbroken with PwnageTool 4.01 Unlocked with ultrasn0w 0.93 Purchased ...
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    Default Unlocked 3GS "No Service" at random

    iPhone 3GS
    iOS 4.0
    Baseband 05.11.07
    Jailbroken with PwnageTool 4.01
    Unlocked with ultrasn0w 0.93
    Purchased with contract from AT&T, now being used with Vodafone in Italy

    For about a week now, my phone will mysteriously and at random drop into "Searching..." for an extended period of time until finally changing to "No Service". This does not depend on location, as it happens anywhere I go, nor time, as it happens at all hours. It does seem, strangely, to be time-based, that is, if I let it sit for 20-30 minutes the signal will eventually come back. Oddly, if I remove the SIM card at this time, it will sometimes even remain at "Searching..." or "No Service", without changing to "No SIM" (though not always). This leads me to believe it is hardware-related, also because I have been using the phone unlocked for about a year now and installed iOS 4 about a month ago, but only recently started seeing this issue. Scouring the internet, I have found and attempted all of the following remedies, all without success:

    Toggle Airplane Mode
    Disable 3G
    Remove SIM card and re-seat
    Turn on Airplane Mode, remove SIM card, replace SIM card
    Reboot phone (Soft and Hard)
    Reset Network Settings
    Reset All Settings
    Erase All Content and Settings
    Restore OS from backup (this I tried many times)
    Restore OS as a new phone
    Downgrade to iOS 3.1.3
    Install BossPrefs before unlock (3.1.3)
    Tape SIM card to SIM tray
    Holding phone in every way imaginable
    etc...

    Oh yes, I've tried multiple SIM cards (AT&T as well as other carriers) in the phone with the same result. And I've placed my SIM into another iPhone and it worked perfectly.

    Please help, I don't know what else to try!



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    Super Moderator Array Olethros's Avatar

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    Reload the baseband to a higher version (3.1.3 or 4.0 - ultrasn0w supports both) and test again.
    Otherwise - it is likely hardware.
    Please read the stickies & search forum before posting!
    How to report an iTunes restore/update fail in a useful manner
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    Super Moderator Array n1ckn4m3's Avatar

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    Quote Originally Posted by Olethros View Post
    Reload the baseband to a higher version (3.1.3 or 4.0 - ultrasn0w supports both) and test again.
    Otherwise - it is likely hardware.
    Yep. Friend of mine had this exact behavior on his iPhone 4, turned out to be a bad SIM slot. If the baseband upgrade doesn't work, you may need to have a hardware swap done.
    The preceding forum post has been brought to you by the letter "N" and the number 42.

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    Thank you both. It does indeed seem to be hardware-related. I discovered this after, in an act of sheer desperation and frustration, I slammed the phone down on the table and, lo and behold... it started working!

    I realize this is not a recommended fix and as soon as I get back stateside I will do a hardware swap, but in the mean time if it ever acts up, all I have to do is give it a quick slap and I'm good to go!

 

 

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