Motorola

(MOT)

dipped to a 52-week low of $20.50, off 20.1%, in early trading after it cut estimates for both the fourth quarter and next year due to slower growth in mobile phone sales. The company reported third-quarter earnings in line with the Street's estimate and ahead of a year ago, but lower revenues sent the stock spiraling down in preopen trading and sparked selling in the sector.

Nokia

TheStreet Recommends

(NOK) - Get Report

was down 6.6% early and

Ericsson

(ERICY)

was down 1.8%.