You will have to contact O2 and ask them to switch off roaming.
Alternatively, when away, put the phone into aeroplane mode then just enable WiFi, and use local hotspots for email. You can use WhatsApp to make calls if the likes of family and friends have it installed
Message O2 on
(Facebook) (https://o2uk.co/O2CFB)
X (Twitter) (https://o2uk.co/O2CTW) or
Instagram (https://o2uk.co/O2CIG) ,
They should be able to help you.
This is not O2 and we are all customers here similar to yourself and cannot answer account type queries.
