You'll need to post a bit more detail if you want help from the community forum.
What exactly are you doing?
What goes wrong?
What error messages?
Are you new or was it working before?
Did something change - home from roaming abroad, new SIM, new phone etc.?
If necessary contact 48 support.
See the link in my signature below or email them at firstname.lastname@example.org
See my previous post above.
It's impossible to give any suggestions without more info about what your exact problem is.