IMHO, a very new concept of displaying the tags on OSM elements when you are in the fields with your android device … try OSMfocus
see http://www.openstreetmap.org/user/MichaelVL/diary/23951
PS: needs android 4.X
Just a note on the side, similar functionality is available with vespucci 0.9.6. When you are in locked mode (aka edits are disabled) a long press will show an information screen for the object. This naturally only makes sense if you have the data for the area in question on device.