1. Ensure that the data service switch is enabled.
< br >
2, please check whether the SIM card is correctly inserted. Insert the SIM card correctly by strictly following the instructions for using the phone or the instructions near the card slot.
3, please confirm that the mobile phone can recognize the inserted SIM card. Mobile phones of different standards support different SIM card types. Ensure that the SIM card is inserted into the correct slot.
4, please confirm whether the SIM card is available. Cut the card is not standard or deep scratches will affect the use, please go to the business hall to change the card and try again.
5, please confirm whether the SIM card fee is sufficient. You can contact carrier customer service for inquiries.
6. If the data plan is set, please check whether the traffic limit is set. Please go to Settings > Traffic management, click > Quota reminder Check that when the used traffic reaches the limit, the network cannot be connected
7. Check whether the WLAN is enabled. When both WLAN and mobile networks are enabled, mobile phones preferentially connect to the WLAN network by default.
Phone or network failure:
1, please reset the APN, and then restart the phone. Enter Settings > More > For mobile networks, in the Access Point Name (APN), click > Reset to default Settings.
< br >
2. Check whether the network is faulty. If this problem is common, report it to your local network operator.
3. Please backup the data and restore the phone to factory Settings, or upgrade the latest software version and try again.
4, if the above method still can not solve the problem, please back up the data and carry the purchase invoice to the after-sales service network for testing.