phone has a poor network registration
phone doesnt register any network
Most of the time, in my experience, it is the sim card. Either it is not seated correctly, or not functioning correctly.
You can reseat it by removing it, and putting it back in.
If that doesn't work, and you know the SIM card is good. You can reset to factory settings, just remember you lose everything on the phone.
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Here are steps to reset to factory.
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