The T2 app will work as T2 Remote. I believe the T2 On Demand is for hearing professionals to do minor programming changes remotely.
You have to hold the phone to your ear, but be careful. That app plays the sounds like a speaker phone, not through the phone earpiece. On my Samsung Epic 4G, that means I need to hold the phone upside down with the screen pointed away from the aids due to the speaker placement on the phone.