Hello, i just bought a new sim card for the phone i already had. i believe the sim card is activated and on my phone shows signal bars, but if i try t? Hello, I just bought a new SIM card for the phone i already had. I believe the SIM card is activated and on my phone shows signal bars, but if I try to make a call my phone says `Not registered on Network` ? ..I am also unable to received calls and texts. Can someone help me please?

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