RadioShack said it won't reach its 2005 earnings target primarily because wireless sales took a hit when Verizon Wireless transitioned out and Cingular Wireless came in. RadioShack expected a considerable increase in Sprint Nextel sales to offset the transition, but it didn't happen. Can we extrapolate what Sprint Nextel sales were like in the fourth quarter from this or was RadioShack being too optimistic?

To find more information about RadioShack's earnings warning:
- check out this article from MarketWatch