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Network issues

Gud day,please am using a Samsung galaxy j3 prime and it was bought from the US to Nigeria were i live.ever since the phone those not connect to 3G or 4G network only 2g network and when ever I tried to set it to 3G from the network setting my network will disappear.i called Samsung Nigeria they requested for my ime number and the later said the phone don't have a Nigerian file that I should contact were I bought it from please I need assistance tnx.