The Semtech modems range from specific 5G and 4G (and some older 3G) modems with fallback to either 3G or 4G (and some for older modems, even 2G). The 4G modems differ a bit from the 5G modems in how to change the preferred technology.

For 4G modems like MC7710, MC7750 and MC7354, these modems do use the AT command AT!SELRAT, which lets you specify what technique you want to use.

The parameters are:
00, Automatic
01, UMTS 3G Only
02, GSM 2G Only
03, Automatic
04, Automatic
05, GSM and UMTS Only
06, LTE Only
07, GSM, UMTS, LTE
11, UMTS and LTE Only
12, GSM and LTE Only

For 5G modems like EM9293, EM9291 and EM9191, they do also use the AT command AT!SELRAT

The parameters:

00, Automatic

01, WCDMA only

06, LTE only

11, WCDMA and LTE only

20, NR 5G only

21, LTE and NR 5G only

22, WCDMA and NR 5G only

If you are using a modem that is not mentioned in this FAQ and the SELRAT settings don't seem to work, please check the specific modem's AT command guide for the correct settings to verify the SELRAT settings.

If the issue still persists, please feel free to create a support ticket, https://techship.com/account/support/new/