NEW YORK (CNN/Money) - AT&T Wireless scored below average in every region of the country in the latest J.D. Power and Associates Wireless Call Quality Performance Study.

The marketing research firm surveyed cell phone users to determine the types of cell phone service problems users found most impacted their perceptions of overall quality and the frequency of those problems. Carriers were then scored based on the frequency and seriousness of problems. Static and interference was rated as the most serious problem by cell phone users. No connection on the first try was the second most serious problem and voice distortion was the third most serious.

"We have dramatically improved our network," said Mark Siegel, an AT&T Wireless spokesman, adding that the survey may not reflect recent upgrades in the company's cellular network.

J.D. Power Wireless Performance Study  Northeast Score  Mid-Atlantic Score  Southeast Score   Sprint PCS 104   Verizon 105   T-Mobile 104   Verizon 104   T-Mobile 103   ALLTEL 101   Nextel 100   (Average) 102   Sprint PCS 100   T-Mobile 100   AT&T Wireless 100   Verizon 100   (Average) 99   Nextel 100   (Average) 99   AT&T Wireless 93   Sprint PCS 99   Cingular 98   Cingular 86   Cingular 97   Nextel 98   AT&T Wireless 93  North central Score  Southwest Score  West Score   Nextel 105   T-Mobile 107   Sprint PCS 105   T-Mobile 101   Sprint PCS 102   Qwest PCS 103   US Cellular 101   Verizon 101   T-Mobile 103   Verizon 100   (Average) 101   Cingular 102   (Average) 100   Cingular 100   Verizon 101   AT&T Wireless 99   ALLTEL 96   (Average) 101   Sprint PCS 97   AT&T Wireless 96   AT&T Wireless 94   ALLTEL 96   Cingular 96

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