In general, the limitations of a 3G network shutdown are bearable. The 1NCE IoT SIM card supports all common cellular standards (2G, 3G, 4G, LTE-M, NB-IoT). If your IoT devices are deployed in a region where one network service is discontinued, the SIM card can continue to transmit data and SMS on the mobile radio standards that are still available locally.
Limitations can possibly arise with the hardware. Please make sure that your modem modules support other radio access technologies besides 3G. If necessary, the loss of the 3G network may require adjustments to the device software to enable specific functions and logic flows of your IoT application. More detailed information can also be found in the 1NCE Developer Hub. Among other useful things, an overview with “recipes” for the configuration of the most frequently used modules is continuously being expanded there.