Are there plans that support VoLTE over LTE-M technology?
The available networks for the Things Mobile SIM card are: GPRS, 3G, and 4G.
Things Mobile SIM cards also offer LTE-M (CAT M1) coverage where available.
Since coverage varies depending on the region and the operator to which the SIM card connects, we recommend checking the updated coverage at the following link: https://www.thingsmobile.com/business/coverage/coverage