Whatsapp on holiday abroad

[Chersfrozenface]

I'm feeling very stupid and need a simple explanation

I have a mobile with a UK SIM card. I have a friend's French number stored in my Contacts with country code at the start.

If I try to Whatsapp my friend when I'm in France using mobile data, will it work with the number as it is currently stored?

Yes.

Yes it will use the same number. But you need to check if your mobile phone plan allows roaming so you can use your mobile data abroad. Otherwise you’ll be charged extra.

Yes

Or just connect to Wifi