A Cisco 1921 router in this deployment is equipped with a cellular WAN module that supports a standard SIM card. Here's a detailed breakdown of how the system operates:

SIM Card Provisioning: The SIM card is provisioned to a nationwide carrier using the device's unique IMEI and ICCID identifiers. The IMEI is specific to the cellular module/router, and the SIM card must be activated by the carrier before use. The ICCID is a unique identifier for each SIM card.

Network Capabilities: The SIM card can operate on 3G or 4G cellular networks, depending on coverage. Each router has a dedicated phone number and supports SMS and voice capabilities on the carrier's network. For support, you will need to provide the phone number or device IMEI.

IP and DNS Configuration: Each device has a statically assigned IP address obtained via DHCP. Private DNS resolution is provided, with each circuit on its own virtual routing instance, primarily used for out-of-band management. The IP can also be used to establish a secure VPN connection to the network.

Carrier Support: To contact the carrier for support, you will need to verify the account name and the last four digits of the associated tax ID.

Command Usage: Running the command show cellular 0/0/0 all on the Cisco 1921 router will display all necessary information about the SIM and unique device identifiers.

Example command output:
CopyModem Firmware Version = ABC_03.05.10.06
Modem Firmware built = 2024/01/12 15:07:45
Hardware Version = 10
Integrated Circuit Card ID (ICCID) = 89148000000282720250
Mobile Station Identifier (MSID) = 8018501392
Electronic Serial Number (ESN) = 0x80DB35DF [12814366175]
Preferred Roaming List (PRL) Version =

Modem Reset: The modem can be power cycled with the command test cellular 0/0/0 modem-reset.

IP addresses:

10.0.0.1 - 10.0.0.2 (Unrestricted) - example PVT

This setup ensures connectivity & management capabilities for remote & mobile deployments using the Cisco 1921 router.

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