There is a diagonal line in the upper right corner of the mobile phone, which means that the mobile phone can't get online and the mobile phone can't search for a signal.

_ I just want to be happy and don't want to step on it. _ What do you want to do?

1, shut down and restart.

2. Change the current geographical location.

3. Under the standby desktop, click Application-Settings-More Networks/More Settings-Mobile Networks-Network Operators-Search Networks-Select the network operators supported by your SIM card.

4. Wipe the contact point between the mobile phone card and the mobile phone.

5. Take out the SIM card, clean the contacts of the SIM card with rubber, and then insert the SIM card again.