Cell phones aren’t just for talking any more.  Surfing the web, storing music and posting to Facebook have all contributed to the near-mandatory use of a cell phone.  How about using that cell phone to lose weight?  Researchers with Calit2’s Center for Wireless and Population Health Systems (CWPHS) and the Department of Family and Preventive Medicine, at University of California, San Diego are expanding a previous study aimed at finding out if cell phone technology can help with weight…