Sprint Developers

I've seen references in the Sprint API to the URI scheme and Internet Media Types but I have not seen a full listed of supported Sprint URI Scheme's. Specifically these are referenced in the Muglet Class.

I have seen the generals like:
http:
socket:
serversocket:
comm:
datagram:
file:
bluetooth:

But the thing I'm confused about and if possible would like insight to is the Sprint specific URI Scheme. I have seen someone mention a "tel:" reference to dial a number is this a valid URI? if so are there others?

Also mentioning the "tel:" reference, can I use this to dial a # from my app?

Or it could be possible that maybe I completely don't understand what's going on but such is reality :) Any reading or references would be graciously accepted.

Thanks!