Why can't vivoy 18l send text messages, make phone calls and surf the Internet after the factory settings are restored?

You can try using a different SIM card, or you can try the following methods. 1. Check whether the SIM card has data access function. Telephone cards need data traffic access service to use data network normally. You can contact your local operator to open it.

2. Make sure that the "data network" switch is turned on, and try to surf the Internet after restarting the mobile phone.

3. Check the signal icon in the status bar at the top of the mobile phone screen to see if there is a weak signal, unstable signal or no signal. If the signal there is not good, I suggest you try to change the network environment.

Please call the operator to check whether the mobile phone is in arrears.

5. You can install the SIM card on other mobile phones for comparison. If you still can't use the data network, it is recommended to try to replace the SIM card. If you can use other mobile phones, it is recommended that you back up the important information of your mobile phone, go to Settings-More Settings-Restore Factory Settings-Restore all settings and try again.

If the problem still exists, please take the purchase invoice, warranty card and mobile phone to the nearest vivo after-sales service center for testing and processing.