I have the same problem. I can't answer the phone and send a text message to remind me.

Sorry for the inconvenience caused to your use!

According to your description, you have tried to replace the sim card yourself to troubleshoot the sim card. But since you didn't provide the specific model you used, you need to check whether it is caused by poor network signal in your area. It is recommended to try a place with a good signal. If it fails, it is recommended that you back up your data, try to restore the factory settings, and rule out whether it is caused by system abnormality. If you can't solve the problem after restoring the factory settings, and your problem still has similar abnormalities after on-site treatment, we suggest that you still need to feedback it to the after-sales site in time so that the problem can be properly handled. Please understand.

Field workers have the obligation and ability to solve the problems of users' products. Lenovo will also strictly monitor the services of various sites, so please feel free to go.

Official website authorized maintenance site inquiry:/Lenovo /WSI/ station/service station.

You are welcome to contact us at any time or visit Lenovo Lewen Bar () for consultation and understanding.