How does p20pro surf the internet with mobile phone traffic while making a phone call?

When making a phone call, please use the following methods to set up Internet access:

Go to Settings > Wireless and Network > Dual Card Management, and turn on the Internet switch when talking.

The data service of the primary card will be interrupted by the secondary card. When this switch is turned on, the secondary card will switch the data connection of the mobile phone from the primary card to the secondary card in a VoLTE call, so that the secondary card can surf the Internet while talking. After the secondary card VoLTE calls, the mobile phone data service will switch back to the main card.

Tip: After the Internet switch is turned on during the call, the secondary card may consume the traffic of the secondary card during the call, resulting in unnecessary billing.

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