error code 9001 usually occur at when voicemail in your phone stops working,
and that leads you into trouble. You may not access your Verizon account
properly. Now you can remove this issue easily. You need to slide over your
phone and look for airplane mode. If it’s active, you need to turn it off, and
by going to settings, you need to turn on the cellular data. In this way you
can fix the issue but if fails then call at Verizon
Support Phone Numberand receive professional support.