I'm having issue using the Verizon network.  I've check to see which sim slot is active and I get the following error message:

127|shell@falcon:/ $ sim_slot_switch 1 5
Diag_LSM_Init: Failed to open handle to diag driver, error = 13ERROR: service_n
ame_valid=0 result=0 error=0
shell@falcon:/ $

Build id 11-09-04-MG-00 test-keys

Kernel 3.10.84-perf-gb6fc1ea-00001-gc9acaa3
Friday Jul 29 22:37:51 EDT 2016
Security Patch level May 1, 2016