I want to use internet only via Wifi, and be asked if I want to use the internet via my SIM (3G or so).
How can I do that? Is there a setting for it?
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you can turn off cellular data (or your internet over your SIM) when you go to Settings->Cellular (or Mobile data) and then turn of Cellular data. Or in Romanian: Configurari->Conexiune celulara and turn off Date celulare
this way you'll use only your wifi connection (if you're connected to WiFi).