I am trying to send SMS and cannot figure out what I’m doing wrong.
For months my modem and code worked fine, but something changed in the past 2 weeks.
I can receive SMS fine but anytime I try to send I see this:
> Hello World(CTRL+Z)
+CMS ERROR: 500
I have also tried to load the message into modem memory using AT+CMGW and sending with AT+CMSS but this also fails with a ‘500’ error.
Have any of you all run into this problem before?
Any ideas what I can check or do to fix this?