Why dial-ups through a 3G Cellular interface always fail

The problem is caused by the following reasons in general:

- The 3G data card is not recognized by the network, or the 3G data card is not included in the supported data card list of the device.
- Some authentications or negotiations fail during the dial-up process because the 3G data card does not match local networks, resulting in dial-up failures. (For example, some special authentications may need to be performed in local networks, if the authentications are not enabled on a 3G data card or a USIM/SIM card, the card does not match the local networks.)
- The 3G data card is not registered to an available network, manifesting as poor signal strength. You can run the display cellular command to check the status of 3G signal. In the displayed output information, the value of the Current Service Status field must be Service available, and the signal strength must be normal.
- The mode of the 3G data card is not properly configured. For example, The network connection method of a 3G data card in which a SIM card is inserted is set to wcdma-only.
- The USIM/SIM card is not available.
- The status of the USIM/SIM card is abnormal. You can run the display cellular command to check whether the status of the USIM/SIM card is normal. The status of the USIM/SIM card must be OK but not Not insert.
- The USIM/SIM card does not subscribe to 2G/3G services (services are not subscribed).
- The fund of the USIM/SIM card is insufficient.
- Check whether the 3G configurations are correct, including the dial-up character string. If you want to dial up to the CDMA2000 network, confirm whether a PPP authentication needs to be performed to access the network.
- The profile is not configured or incorrectly configured.
- Check whether you disable the 3G Cellular interface by running the shutdown command.

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