For use Huawei s3372h with Stick type of firmware
use AT^SETPORT="FF;10,12,16"
data port = 0
info port = 1
But for use same modem with PC you can set:
AT^SETPORT="A1,A2;10,12,16,A1,A2"
maybe nessesary to check "Ignore direct IP modem" in System Ports