Sprint PCS shares fell US$0.93 to US$9.27 after dropping 20 percent to US$8.21, a level last reached in December 1998. Shares of Sprint PCS and other wireless operators have been hurt this year by concerns the US mobile-phone market is running out of room to grow after years of rising demand. Verizon Wireless Inc is the biggest US mobile-phone company.
Sprint PCS on Feb. 4 reported a fourth-quarter loss of US$328 million and said it expects to add 3 million customers this year, down from an earlier forecast of 3.6 million to 3.7 million.
Sprint PCS added 4 million new customers last year.
Qualcomm Inc shares fell US$2.65, or 6.6 percent, to US$37.40.
Sprint PCS is indirectly one of the San Diego-based company's biggest customers, as its wireless network and phones run on Qualcomm chips and patents.
Shares of Sprint's long-distance business fell US$0.50 to US$13.30.
The stock touched US$12.51, the lowest price since 1995.
About 20.3 million shares were traded, more than four times the three-month daily average.
Sprint trails AT&T Corp and WorldCom Inc in the US long-distance market.
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