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    Default Samsung Galaxy S3 I747M not registered on network approximately below -70dbm

    I have a SGS3 I747M from Canada Fido network unlocked and now using in Pakistan. It does not register on GSM 2G/3G network whenever the 2G signal strength drops approximately below -70 dbm. It can neither make nor receive a 2G call

    Things tried so far
    tried all available modem drivers from XDA Forums
    tried on stock Jelly Bean 4.3
    tried on stock KitKat 4.4.2
    tried changing to airplane mode and back
    tried change network mode to 'GSM Only'
    tried signal boosters from android market

    But nothing works.Only where signal is strong around -50 to -60 dbm it is able to connect to the network.

    have tried it on two different operators Mobilik and Warid but result is same.

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