How can I check if the SIM card in my SHIELD Tablet is valid?

If the SIM card is inserted correctly, you should see a valid “Network” listed and “Service state” when you look at

Most SIMs provide a notification that “SIM is not provisioned” if they are invalid. But it is always best to check with your carrier on the validity of the SIM.

If phone number is listed as unknown, here are some troubleshooting tips:

  Check if baseband version is listed correctly or unknown.

  Check if device is camped and registered on network.

  Check if you are able to manually search for networks.

For expert users, there are two ways to check inside adb shell

Must see READY here as response.

must see phone number listed here as response

NOTE

  Verizon and Sprint are currently unsupported in the US.

  Carrier must provide 2G, 3G, or LTE Network. CDMA/EV-DO based networks are not supported.