Using cellular modems in a Wireless WAN (WWAN)

The LR54 supports one cellular modem, named WWAN cellular modem, which is included in a preconfigured Wireless WAN, also named WWAN.

The cellular modem can have only one active SIM slot at any one time. For example, WWAN cellular modem can have either SIM1 or SIM2 up at one time.

Typically, you configure SIM1 of the cellular modem as the primary cellular interface, and SIM2 as the backup cellular interface. In this way, if the LR54 device cannot connect to the network using SIM1, it automatically fails over to SIM2. LR54 devices automatically use the correct cellular module firmware for each carrier when switching SIMs.