Question about Huawei E3372h-320

Prepaid works without any problems. In my case with Sunrise and Salt. The purpose of the application was an LTE test for Fritz!Box: only Internet is possible here, no telephony with SIM as with Huawei E173, for example. In addition, DDNS does not work because mobile connections are gated in Switzerland. This is why the (much better tower) Huawei B618s-22d from Sunrise, for example, can only be used to a limited extent with the Fritz. VoIP and internet telephony including fax, however, work without problems with the products and Fritz behind them, all with prepaid.

I do not use a prepaid card. Sorry.