Connecting to the Internet without wifi

Can anyone explain why when I am in a Cafe or somewhere without Wifi, my friends can all access the Internet while my phone just says no Internet and does not connect to anything?, shows 4G then H+ at times.

Some are with Smarty others are not, could it be a phone setting? Phone is Samsung 10e. Our phones are literally next to each other and show a 4G signal.

My Internet settings match the smarty settings.

Apologies if I`m missing the obvious but I`m not clued up on these things.

Thanks.