Hi @Chedzey, there are many reasons it could have been, but it’s difficult to tell retrospectively. Somethings to look out for in the future are the following:

Make sure roaming is enabled in both handset settings and the iD Mobile App.

Make sure APN settings are correct.

Ensure you’re connecting to the correct network.

Rebooting the handset once arriving at your destination can often prove effective.

If ever you’re abroad again and experience something similar, let us know whilst you’re there and we’ll be sure to get ti fixed as soon as possible.

Will