What AT commands are required to register an IoT modem on Verizon?

When registering IoT devices on the Verizon network, it is typically necessary to use a series of AT commands to configure the modem and ensure the device can connect and communicate correctly. The following are some common AT commands and steps:

1. Check SIM Card Status:

   • AT+CPIN?
     This command checks the status of the SIM card. The response should be +CPIN: READY, indicating the SIM card is ready and not PIN-locked.

2. Set Device Operation Mode:

   • AT+CFUN=1
     This command sets the device's operational mode. 1 typically represents full functionality mode, where all features—including radio functionality—are enabled.

3. Set Network Mode and Band:

   • AT+URAT=5 and AT+BAND=12
     These commands configure the device's network access technology and frequency band. 5 usually corresponds to LTE, while 12 is a commonly used LTE band. Specific values depend on Verizon's network configuration and device compatibility.

4. Register Network:

   • AT+COPS=1,2,"311480"
     This command manually selects the network and attempts registration. 1 indicates automatic mode, 2 specifies numeric format, and "311480" is Verizon's network operator code.

5. Check Registration Status:

   • AT+CREG? or AT+CEREG?
     These commands verify the device's network registration status. The response should confirm successful registration.

6. Configure APN (Access Point Name):

   • AT+CGDCONT=1,"IP","vzwinternet"
     This command sets the device's APN configuration. 1 is the Profile Identifier (PID), "IP" denotes the protocol type, and "vzwinternet" is Verizon's standard APN.

7. Activate Data Session:

   • ATD*99#
     This command initiates a data call to establish network connectivity.

8. Check Signal Quality:

   • AT+CSQ
     This command returns signal quality indicators, which help assess the connection quality between the device and the network.

By using these basic AT commands, an IoT device should be able to register on the Verizon network and initiate communication. In practice, adjustments or additional commands may be required based on the specific device model and network environment. Additionally, for debugging and troubleshooting, further commands may be necessary to retrieve device status information or modify configurations.