Comment 32 for bug 1167994

(In reply to Mikhail from comment #4)
> But still not enough information in Network Manager why couldn't connect to
> 4G network. May be sim card is locked or broken or not enough money on
> account. This information are necessary as the air because modem sim card is
> not compatible with modern phones (Nano-SIM). And transfer SIM card to phone
> is not possible.

Are you sure, idVendor=12d1, idProduct=1506 is not the target (modem) mode? I think so, as this config is for 12d1:14fe:

# Huawei E352 (T-Mobile NL), E173s (Variant)
TargetVendor=0x12d1
TargetProductList="*1506*,150f,151d,1c1e"
HuaweiNewMode=1

Also the "option" modem device driver is loaded:
option 1-9.1.2:1.1: GSM modem (1-port) converter detected

AFAIK the E398 needs ModemManager running and a mobile broadband connection profile set up (no hostless modem).