Skip to main content
All CollectionsTroubleshooting guides and FAQsConnectivity issues
I have inserted the SIM into my device, but it fails to establish a data connection
I have inserted the SIM into my device, but it fails to establish a data connection

Make sure that APN, data roaming, and network registration settings are correct.

C
Written by Customer-Success
Updated over a month ago

Environment

  • Onomondo app: Network Logs

  • Device: applicable to all

Issue

  • The SIM is inserted, and Network Logs are present, but there is no data attach for 2G / 3G / 4G / NB-IoT networks during the time period of the issue.

  • The device registers to the network but fails to establish a data connection.

  • I see "allowed to use data" in Network Logs, but no data sessions.

  • The Network Logs display "Allowed to use data", but not "Attached data connection".

Solution

  1. Ensure that the APN is correctly set to "onomondo" (all lowercase).

  2. Set data roaming setting to: enabled (if applicable).

  3. Ensure that the device is using the correct network registration response:

    1. Use +CEREG for 4G/LTE (desired response: 5).

    2. Use +CGREG for 2G/3G (desired response: 5).

You can also use the Connecting with AT Commands to help you check your connection with most cellular modules.

If you are still having issues, you are welcome to reach out to us at [email protected].

Cause

"Attached 2G/3G/4G connection" event indicates a successful network registration. This means, that the device with SIM is able to attach to the network and the SIM works fine.
​
However, if the device does not establish a data session afterwards, it might suggest that APN settings are either incorrect, preventing the device from accessing the Internet, or that the device is misconfigured.

Did this answer your question?