What country are you in?
Is anything working? Connection to local network? Calls? Texts? Mobile data?
Can you describe what happens when you try to use the phone?
Any error messages?
Otherwise the usual advice applies in the context of roaming problems...
If your SIM predates January 2023 then a replacement may mitigate or eliminate roaming problems:
It may be worthwhile reviewing these two threads in case any of the suggestions help to avoid roaming problems:
If you still have problems then you'll probably need to contact 48 support for further assistance.
