yesterday
yesterday - last edited yesterday
What exactly do you mean by "I changed SIM card"?
Do you mean that you got a replacement SIM?
Or did you get a brand new SIM?
Did you follow the SIM activation instructions for the replacement or new SIM without any errors?
What exactly are the symptoms of the problem?
What happens when you try to buy a membership plan?
Any error messages?
If you need to contact 48 support about this then see the links in my signature below.