Do the SIM cards work with the GSM network?

The following networks are currently available: GPRS, 2G, 3G, 4G.

The coverage varies from zone to zone and with the operators to which the SIM cards connect. For the latest coverage details, see here:  https://www.thingsmobile.com/business/coverage/coverage
If you would like detailed information about the coverage in your area for the operators to which the SIM cards connect, we recommend that you visit https://www.opensignal.com/networks and follow the instructions.