I’m using Debian Linux 7.0. I have a MC7700 card and a AT&T SIM card on the dev board connected over USB, with both antennas connected. I connected to my MC7700 over serial and followed the instructions given on the “Can I use a Sierra Wireless modem with Linux” page. I want to connect to an AT&T data plan, so I did the following:
+CME Error: no network service
[ 7265.111629] sierra_new 1-1:1.7: wwan0: Link type unsupported: 0xff
[ 7265.111629] sierra_new 1-1:1.7: wwan0: Invalid LSI
The last two lines are output from dmesg, not serial data from the card. I have a recent version of both the sierra and sierra_net drivers (1.7.16 and 2.0 respectively), so I don’t know why I would get this error. What circumstances cause this error? What can I do to avoid this error?