Hi @crok,
Welcome to the HP Support Forums! 
I understand that you are getting an error 651 with your Sim card on your HP ProBook 650 G1Notebook PC. Your ProBook is a Business computer and you would get the best answer to your questions on the Commercial forums. You can post your questions here at the HP Enterprise Business Community.
In the meantime, here is the HP ProBook 650 G1 Notebook PC support page that may have a solution for you. I am also including the video for Error 651 that explains how to clear this error.
I hope this information helps, please let me know how it goes.
Best of luck and have a great day!
I worked on behalf of HP.