The (almost) all - Always with you - // router with 4G

one has Wi-Fi via battery and mains operation for:
- In motor vehicles
- On holiday
- In the apartment
General or even abroad or traveling -

Conclusion:
Always the 'own' wireless cost for all the equipment here - so no expensive data passes longer necessary.
A local pre-paid SIM data and already all comes online.

Compared to a 'correct' router lacks:
VPN and VoIP router function. That makes for example a FB7390 (incl. DECT)

Update:
Since the Huawei E3276s not out-of-the-box does a tip.
There is an earlier firmware version requires:
[...]
One uses then T-Mobile / Telekom.de is correct yet the APN manually.
APN: internet.telekom
In order to get even with the Huawei E3276s // T-Mobile / Telekom Speed ​​Stick LTE III online quickly.
Other changes (AT ^ setPort, foreign FW, etc) are not necessary.