OnePlus 3 won't connect to 3G or 4G


    Hello! Can you help me please - my phone (OnePlus 3, bought in Europe) won't connect to any T-mobile network past EDGE (no 3G, 4G and LTE, so internet connection is really slow). I've been to T-mobile office with this problem and after examining my phone they assured me that my connection settings are all right and I should be able to connect to faster networks.

    I've tried to reload phone and put it in and out of airplane mode multiple times - it doesn't changes anything.

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