I’m currently on holiday and I can’t make calls or receive
If you have an iPhone change the APN to "mobile.o2.co.uk"
Or contact O2 on social media to remove the roaming bar on your account.
You can message O2 on Facebook ( https://o2uk.co/O2CFB) , Twitter ( https://o2uk.co/O2CTW) or Instagram ( https://o2uk.co/O2CIG) , they should be able to help you with this
*The Game Is On*
Abroad where ?
PAYG or contract?