You can enable and disable IPv6 on cellular modems either from the Unit Panel or from the Web Interface.
Unit Panel
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From the Home menu, tap
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Toggle the IPv6 cellular modems field on or off to enable or disable IPv6.
Web Interface
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From the Web Interface, in the sidebar click Settings > System.
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In the Preferences section, toggle IPv6 Cellular Modems on or off to enable or disable IPv6.
