Question on gps info in cellphone-snapped pictures -- for short article on mobile web

Hi, I'm trying to write a short online article on mobiles and how they are something of a solution to the limited bandwidth (particularly in the third world).  I have a couple of quick questions -- hope these are not off-topic; the questions cover two different issues, so I am sending two emails.  Here's the first question:
 
1.  I am interested in mobiles' picture-snapping capability.  Is the .gps ever automatically included in the .exif file in the picture?  Or does the .exif normally include just the time unless you first generate a .gps location track and then matched with the time data in the .exif files? 
 
(The ability to snap pictures with the .gps can obviously provide very useful data; at the same time there are some privacy issues.)
 
(Sorry for asking a dumb question; I don't use my mobile for much; everything happens on my laptop.)
 
Best,
 
--C. E. Whitehead
cewcathar@hotmail.com