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I have recently bought a Zte Axon M model z999 from AT&T network which is unlocked but there bandwidth for 3G & 4G are set for certain region network. Apparently both the 3G & 4G bandwidth is not set for this region using the 2600 band. I understand this could be selected in the hidden menu of the phone. Can someone advise me how I could access that menu for selection? Thank you