update iOS on jailbroken iphone 3gs lose t-mobile phone service?

Discussion in 'iPhone Tips, Help and Troubleshooting' started by Sossity, Dec 8, 2014.

  1. Sossity macrumors 6502a

    Joined:
    May 12, 2010
    #1
    A while ago, I bought an iphone 3GS untethered and jaibroken, so I could use it with T-mobile.

    This was when at&t was the only carrier of the iphone, and t-mobile did not carry the iphone.

    I got t-mobile service on it and have used it since, but when I plug into itunes, I am prompted for an update to the iOS, from 4.3. (what I have now) to 6.0.

    I have always chose no update in itunes, for fear that I would lose the jailbrake, and lose my t-mobile phone service on it.

    if I updated the iOS, would I lose my current T-mobile phone service with its current plan?
     
  2. Applejuiced macrumors Westmere

    Applejuiced

    Joined:
    Apr 16, 2008
    Location:
    At the iPhone hacks section.
    #2
    It depends.
    Are you using ultrasnow from cydia to unlock the phone?
    If you do then yes you will lose the unlock and the JB and you will be stock on a locket AT&T iphone that you cannot use.
    You can always purchase an IMEI unlock for it though, they're not that expensive for a 3GS.
     

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