Your post was blank @aleksanderk2609 and the subject line doesn't really give much information.
If you want assistance from the Community Forum then you need to explain your issue clearly.
Did you follow the SIM activation instructions here?
Did that go ok or were there any problems/error messages?
Is your phone unlocked for use on any network?
Are there any error messages on the phone?
If you do a manual search for networks can you see and connect to 48?
If you need to contact 48 support about this then see the links in my signature below.
