The portion of adults with only cellphones grew by more than 2% in the latter half of in 2006 to nearly 12%. 25% of Americans 18 to 24 had only cellphones, as did 29% of those aged 25 to 29. 15% of Hispanic adults, 13% of black adults, 12% of Asians and 11% of whites had only cellphones. 22% of the poorest adults had only cellphones, double the rate for those who are not poor. 13% of males and 11% of females had cellphones only. Nearly 2% of adults had no phone at all, CDC reports.