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My Samsung exhibit T599 is having no network issue after its screen was changed. Please, what can I do to rectify this problem, thank you. Best Regards.

Are you sure all the wires were reconnected properly before you reassembled it? It can be common that a connection wasn’t put back on correctly. It could also be possible you just have to make sure the date and time is set correctly. I have heard of people knocking something on the board that makes this faulty but that was with the screen replacement of IPhones, not sure if it could be the same thing with your phone.