iD Mobile doesn’t have any telephone support.  I’d recommend trying the following:

1. Reset Network Settings
2. Try replacing the SIM
3. Try a different handset

Reset Network Settings

To reset network settings, the steps vary depending on the device being used.

For iPhone:

1. Open Settings.
2. Tap General.
3. Tap Transfer or Reset iPhone.
4. Tap Reset.
5. Select Reset Network Settings.
6. Enter your passcode, then tap Reset Network Settings.

For Samsung Galaxy:

1. Open Settings.
2. Tap General management.
3. Tap Reset.
4. Select Reset Network Settings.

For Most Other Android Phones:

1. Open Settings.
2. Tap System.
3. Tap Advanced.
4. Tap Reset options.
5. Select Reset Network Settings.

Please note: Resetting network settings will erase saved Wi-Fi networks and VPN settings. After the reset, you will need to re-enter Wi-Fi passwords and configure any other network settings as needed.