Has anyone used mobile 4G SMS to change their cards?

If you can't use the 4G network, we recommend that you:

1. Check whether the mobile phone card supports 4G service.

2. Whether to select the 4G network mode: set the connection-mobile network-network mode SIM 1/SIM2-4G/3G/2G (automatic connection) or 3G/2G (automatic connection).

Note: When two cards are inserted into Unicom/Mobile Card, 3G or 4G networks cannot be used at the same time. If one card is set to 4G/3G/2G (automatic connection) or 3G/2G (automatic connection), the other card will automatically become only 2G network.

3. Please confirm whether this area is within the coverage of 4G network, and try another location.

4. Shut down and restart or try to replace the card.

5. If it is invalid, it is recommended to back up the materials (contacts, materials, photos, etc.). ) and try to restore the factory settings;

If the problem still exists, please take the purchase invoice, maintenance card and machine to the service center, and the professional after-sales engineer will help you test it.