Hello,
I've just started to use my Sony Ericsson Xperia X8 android phone connected with my Garmin Ant+ HR, Cadence and speed sensors.
And yes it works great.
I can read them with the Ant+ Demo apps and much useful, Endomondo, the android sport application, can read theme also and record the ant+ data together with the GPS and other data.
This is great !
Regards