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Wifi, mobile data and vpns

Just afew relatively simple (I believe) questions.

1. If I connected to a wifi network with mobile data on, which service will be used - wifi or mobile data?

2. If wifi and mobile data are both on can I set the Galaxy S20FE to use wifi by default?

3. Whilst on ( a possibly open) wifi hotspot I can use my vpn to protect my browsing the internet using the internet. How do I protect the phone whilst browsing the internet using mobile data?


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