How to set up phone for use abroad when there is no Mobile Data Network option

SandraF_1066290  I would suggest that you carefully check the Settings area on the phone. There must be an option to turn off mobile data and there you will probably find the settings that need to be changed once before you can roam.

https://community.smarty.co.uk/t5/faq/setting-up-your-ios-device-to-work-abroad/ta-p/7918

andthere is a similar article under 'FAQ's" for Android devices