Mobile data roaming not working in Greece

[#1]

Hello

I am in Greece At the moment. I can make calls but data roaming is not connecting me to the internet although phone has found a local provider and the signal 4G is showing next to the provider’s name.

I have an iPhone and tried hard restarts and taken the sim out and back in but problem persists.

How can I find my APN to take to local provider local shop to see if they can help?

I would appreciate some help

Thank you

[#2]

@Litsa61 

Is this that which you seek?  https://www.plus.net/help/mobile/mobile-phone-and-voicemail-settings/

[#3]

@Baldrick1

I have an iphone7plus. I went to mobile data->mobile data options-> and all it has is data roaming on , voice & data 4G, volte on.

No mention of APN anywhere unfortunately.