I have read a lot of the same question so I can only apologise for the repeat of this question.
I have a Samsung A50 and can not use my data when abroad. I can connect to Wifi, send text messages and recieve calls, but unable to use my data for internet use.
I have checked my APN and it matches that advice already given. I can not find in settings general/profile. Please could I have another answer to help me. I am away this weekend in the EU so would like to try out the new advice before then.