Hi, I am having difficulty, using data mobile, roaming in Spain. I cannot access the internet or whatsapp unless I use wifi. It means I cannot use google maps to get around.

I tried to set up a new APN for 48 Internet and MMS on my phone, however although I chose the option to save it, it disappeared. Samsung galaxy A53. Surely 48 should have set the APN up on the sim automatically . Any advice on what to try next would be appreciated. 
Many thanks.