The mobile Internet tsunami has changed the way investors buy and sell tech stocks, Cramer said Thursday In the past, this sector traded by the season. But now the smartphone revolution, in addition to a number of reported earnings beats, the sector is gaining its own independent momentum.

  • Mad Money's Most Memorable Moments

Case in point: RF Micro Devices , which on Monday guided up by preannouncing stronger-than-anticipated numbers for the current quarter. The smartphone component maker now expects sales of $240 million to $245 million, a 41 percent increase from last year.