Zte Blade A31 Lite User Manual page 34

1. Open Settings and touch Network & internet.
2. Touch either one of the two card names at the top.
3. Touch Calls preference / SMS preference to set the
preferred SIM for outgoing calls and messages.
To allow non-data card to use data during calls:
When the non-data nano-SIM card is connected to a call, the
other nano-SIM card cannot use data service. You can set the
non-data card to use data temporarily during the call.
NOTE:
This feature is only useful when VoLTE service is available for
the non-data card.
1. Open Settings and touch Network & internet.
2. Touch the name of the non-data card at the top.
3. Touch Advanced and turn on 4G Calling / VoLTE and Data
during calls.
Control Mobile Data Use
1. Open Settings and touch Network & internet > Mobile
network.
2. If two nano-SIM cards are installed, touch one of the card
names.
3. Touch the Mobile data switch to enable or disable mobile
data for the current card.
4. If prompted, touch USE [card name] to confirm.
NOTE:
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