@Shanook79When roaming a number of factors kick in such as the local network, which o2 have no control over.
The first thing i would do is try and connect to an alternative network and test that it works from that
Also check your apn is set to mobile.o2.co.uk
Also it might be worth contacting o2 to see if you have any roaming bars on your account.
To contact Customer Services dial 202 from your o2 phone or 0344 809 0202 from any other phone
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iPhone 16 Pro Max - o2 and Spusu
Xperia 1V - Spusu
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This is not customer services and we dont have access to your account
I do not work for o2 or any VMo2 /Telefonica/Liberty Global Company