One plus eight is a bad sign.

When your one-plus-one mobile phone has no service or poor signal, please follow the following steps to troubleshoot:

If there is a metal mobile phone case, it is recommended to remove it before testing, because the metal mobile phone case may interfere with the transmission and reception of signals.

In places where there are many people or the signal is weak, the cell phone signal will fall back. I suggest you try to avoid crowded places, go to places with strong cell phone signal coverage or connect to WiFi.

Take out your mobile phone SIM card, try to change a mobile phone and check whether it is damaged; If not, clean the mobile phone chip before inserting it for post-test, or insert the available SIM card of other operators for post-test.

To determine whether the SIM card is current-limited, it is suggested to restart the mobile phone and switch flight modes to see if it is back to normal.

If you still have the same problem, please click Settings >; Software update ",check whether the version of your mobile phone system is the latest version, and test it after upgrading your mobile phone system to the latest version.

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If the problem cannot be solved through the above investigation, it is recommended that you go to the offline service center for detailed detection and handling.