Hello prapulla177,
Welcome to the Apple Support Communities.
From your post, it sounds like you're running into an activation issue. Based on the error message, it may indeed be best to get in contact with your wireless carrier, particularly if the new SIM you mentioned needs to be activated for use on their network. However, there are a few steps you can try first if you haven't already. You'll find them in the link below:
If you can't activate your iPhone
I recommend working through these steps to see if they help with your activation issue. If they do not, that's when you'll need to contact your carrier directly for further assistance.
I hope these steps help.
Take care.