A sign of Verizon Wireless is seen at its store in Westminster, Colorado April 26, 2009. REUTERS/Rick Wilking NEW YORK (Reuters) - Verizon Wireless, the top U.S. mobile provider, plans on Tuesday to unveil a version of the Apple Inc iPhone for its service and will kick off sales of the device a few weeks later, a source told Reuters. Verizon Wireless will offer the iPhone to its customers under it