huawei e1550 в связке с smstools долго использовал для SMS, работало стабильно.
Можно тут посмотреть
https://smstools3.kekekasvi.com/index.php?p=hardwa...
и тут
www.raspbx.org/documentation/gsm-voip-gateway-with-
chan_dongle/#:~:text=Hardware%20requirements,better%201.2A%20or%20more.
Modems reported working/not working
On top of the compatibility list on the original chan_dongle wiki, users of RasPBX have reported several modems to work fine with the RPi:
E153
E1550
E1552
E156G
E160
EG162
E166
E169
E171
E173 (some types of E173 seem to not work, only E173 with Qualcomm chipsets do work)
E1750
E180
E303
K3520 (not to confuse with K3520-z)
K3715
K3765a
The following modems had issues and could not me made working so far. Please let us know if they work for you nonetheless:
E150
E1752
E303C
E352
K3520-z
Не самый дешевый, но стабильный и гибкий
goip 1