What's the matter with no signal and no service on the mobile phone?

If you are using an OPPO mobile phone, the signal in the status bar is poor, unstable or out of service for a long time, please follow the following steps to troubleshoot:

1. Confirm the current signal strength. Path: "Settings >; About this machine > status information > SIM card status >; Signal strength ";

2. Please confirm whether the mobile phone system version has been updated to the latest. Click "Settings > (About this machine) > Software Update" to upgrade the mobile phone system version to the latest.

3. It is recommended to use the original protective case of mobile phone instead of metal or gold-plated protective case.

4. If you are in a special area (bus station, high-speed railway station, basement, elevator), the cell phone signal will be affected. I suggest you leave such an area for a distance and try again.

5. If the SIM card hardware is damaged, it will also lead to abnormal signal. It is recommended to 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.

6. If there is a problem with other mobile phones in the same area, it can be determined that it is a network problem of the operator, and it is recommended that you feedback the problem to the operator for handling.

If the above methods fail to solve your problem, please bring your mobile phone purchase voucher to the local OPPO official authorized service experience center or choose two-way mail-free maintenance service to send your mobile phone to the designated service center for processing.