1. nomoore's Avatar
    I just got unlock codes from tmobile for my 2 LUMIA 635 phones. I didn't realize you need a third party sim to unlock. So I have a couple of questions.

    1.) Do the unlock codes expire? If so how long do I have to get a sim to unlock with?

    2.) I read somewhere that you must be in the service area for the sim you are unlocking with. Does that sim need to be activated too? So could I buy something like a $0.99 straight talk sim and use that to unlock without buying a bunch of minutes?
    04-01-2015 11:34 PM
  2. xandros9's Avatar
    1. I do not believe the codes will ever expire.

    2. I don't think it needs to be activated or in service, I think it just needs to be a different SIM. I would probably try to borrow a SIM from a friend on a different carrier to use or get a cheapo unactivated ST or T-Mo SIM.
    nomoore and RumoredNow like this.
    04-01-2015 11:52 PM
  3. RumoredNow's Avatar
    1) Nothing you do should ever reverse the unlock... If you took it for service and they replaced a certain chip it might revert back...

    2) You don't even need a SIM card. Open Phone and on the dialer pad type ##7820# you don't even have to press call. It will automatically take you to a screen with a SIM card and a Padlock icon. There is a field there to enter your unlock code and press the check mark. Your icon will change from locked to unlocked. Done.
    Elitewolf and xandros9 like this.
    04-02-2015 10:35 AM

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