Why is my phone say not registered on network
when i want to call it says not registered on network
Check how many mobile phone service provider networks are shown in Settings > Connections > Mobile Networks > Network Operators.
If there is only 1 network provider shown and the SIM card in the phone is not from that provider then the phone can't make/receive calls. The phone is locked to the network provider shown.
You need to either use a SIM card from that service provider or get the unlock code from them to unlock the phone so that it can be used with any service provider in your location
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