Hello,
For specific fan commands please use this voice prompt format:
Fan name: Fan
"Set Fan to Off"
"Set Fan to Low"
"Set Fan to Medium"
"Set Fan to High"
If MobiLinc doesn't fully understand the voice phrase, but does pick up on the fan device, then MobiLinc will rotate between speeds.
From:
http://mobilinc.com/features/voice/Wes