What should I do if there is no signal after installing the SIM card, I can't make calls, I can't use the mobile network, and I can't send text messages?

1. Insert the SIM card into another mobile phone to verify whether it is normal.
2. It is normal in other mobile phones, please add the APN parameters of normal mobile phones to mobile phones with no signal (APN add column has steps to view APN and add APN steps)

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