SpaceMace,
If you want to do something like put a phone on a table, just pop this line in the phone's init field:
this setpos [getpos this select 0, getpos this select 1, HEIGHT]
replace height with the height you want the object to sit at. For stuff on tables usually 1 works. This will keep the object right where you put it in the editor, only it will move it up however many meters you want. Works for any object. Also, while units will fall if they are in the air with nothing under them; objects will hover in midair even if nothing is below it.
Hope this helps.