This accessing the internet through your mobile network. It is how you get content or ‘data’ (from web and email servers e.g. emails, WhatsApp and apps) to your phone over your mobile network using 3G, 4G or the fastest 5G and NOT WiFi broadband. Mobile data plans have agreed amounts of data that you can transfer per month. There will be a charge if you go over your allowance. Check ‘data usage’ info on your phone and turn off mobile data if you are over your allowance then use WiFi only (until the end of the month)