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To set the default card for data connection: 
1. Open Settings and touch Network and Internet > Mobile 
network. 
2.  Select the card which you want to set as the default one for 
data connection. 
3. Switch on Mobile data. 
To allow the non-data SIM card to use mobile data during 
calls: 
When two nano-SIM cards are installed, you can allow the 
non-data SIM card to temporarily use mobile data. 
1. Open Settings and touch Network and Internet > Mobile 
network. 
2.  Select the non-data SIM card. 
3. Switch on Data during calls. 
Control Mobile Data Use 
1. Open Settings and touch Network and Internet > Mobile 
network. 
2.  Select a card if two nano-SIM cards are installed. 
3. Touch the Mobile data switch to enable or disable mobile 
data use. 
Select Preferred Network Type 
1. Open Settings and touch Network and Internet > Mobile 
network. 
2.  Select a card if two nano-SIM cards are installed.