The device supports LTE-M and NB-IoT cellular technology. The default standard is LTE-M and in order to change to NB-IoT we need to reflash your modem firmware, so that is something you can not do afterwards.
Low power cellular networks
LTE-M or CAT LTE Cat-M1 is a 4G/5G technology. These LPWA cellular technologies are designed to connect IoT-devices to cell towers while using low energy. LTE-M does support handovers and roaming so it is possible to use this device in areas with multiple base stations. In some areas of the world NB-IoT is more popular, in some LTE-M.
The device supports 17 bands from 699 MHz to 2170 MHz (world-wide support), subject to network. Bands supported are currently: 1, 2, 3, 4, 5, 8, 12, 13, 14, 17, 18, 19, 20, 25, 26, 28, 66 (narrowband LTE UE categories M1/NB1).
SIM card
The device uses a nano SIM card for connectivity. This SIM is best installed by us and not to be removed. Ok, well in practice it can be removed, but the SIM-holder usually gets bent if you try to get the SIM-card out.