1. WPCentral Question's Avatar
    SERIAL NUMBER: aa3e5c77bf59ce754e8211866537d903

    FIRMWARE VERSION: 8.10.15148.0

    MANUFACTURER : Microsoft

    MODEL NAME: Lumia 640 LTE

    IMEI Number : 358597060959403

    Windows Phone.

    When I insert the MTN SIM Card the below message appears on the Screen.
    "The device is locked to a specific mobile operator. Contact your mobile operator for the unlock code".
    Please kindly advise me on what to do, so as to use my Windows phone in Cameroon.

    01-30-2016 04:30 AM
  2. harihar akhil's Avatar
    It says that your device cannot be used with any other telecom operator other than the one it has been in contract with. You need to contact telecom operator to which the phone belongs to and get it unlocked to use with other sim cards.

    forum administrators please remove the serial no and imei from this post
    01-30-2016 05:04 AM

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