Hi ​@Bloke, 

Thank you for reaching out, and I'm sorry to hear that your internet still isn't working while you're in Kos. I understand that you don't want to reset your network settings, so we won't recommend that as the first step.

Please follow our roaming troubleshooting guide to check that your handset and roaming settings are configured correctly:

I'm abroad and roaming is not working – what should I do?

or 

The guide includes steps for checking your mobile data, roaming settings and network selection without requiring you to reset your network settings.

Once you've worked through the relevant steps, please restart your handset and test your mobile data again.

If your internet still isn't working afterwards, please contact us via Live Chat so we can review this further and assist you while you're abroad.

Owethu