1. First, slide the phone screen, find the settings, and then click Open.

2. Locate the cellular network, and then click Open.

3. When the cellular network is turned on, click the secondary symbol.

4. After opening the auxiliary number, click to enable it.

5. At this time, the minor number has been enabled, return to the previous interface, click cellular data, and click the minor number.

6. At this point, the cellular data has been switched to the secondary number. When switching cellular data is enabled, when the secondary number encounters signal difference, it will switch to the primary number.