A Soracom IoT SIM transitions from "Ready" or "Standby" to "Active" when it registers to the network or establishes a session. The specific trigger depends on the subscription type of the IoT SIM (e.g., plan01s, plan-D, etc.).
This means that even if the IoT SIM is inserted into a device (modem), its status will not change unless it connects to a network.
If you want to keep the SIM in the "Ready" or "Standby" status, please make sure the modem is configured not to connect to the network.
Note: How to retrieve IoT SIM information without connecting to network
When retrieving SIM information such as IMSI during device setup without connecting to the network, please consider the following:
- Many modems support commands like
AT+CFUN=4to disable the RF (radio function) while still allowing you to read SIM information. - Some modems may prevent access to SIM information when switching to airplane mode with commands like
AT+CFUN=0.
Please refer to your device’s manual for the exact AT commands and behavior, as these can vary by modem.