Below is very interesting data according to CTIA as of December 31, 2007. Impressive U.S. subscriber growth! YEAR SUBSCRIBERS 1985 340,213 1990 5,283,055 1995 33,785,661 2000 109,478,031 2005 207,896,198 2007 255,395,599 If we assume 20% of 2007 subs have data plans (which I…