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To change main WAN from Wired to Mobile send these commands as SMS messages:
A simpler but more clumsy way would be to reset the router to its factory settings. In the default configuration Wired set to main and Mobile is set to WAN failover. For that you would only need one message:
Yet another method would be to use RMS. If the router has an active Internet connection, you can add it to RMS and control however you wish from there. If the router was never added to RMS before, you'll be able to use it 1 month for free. More info on RMS here.
Hope any of this helps, good luck.