Google Inc. is jumping onto the crowded m-commerce field with a wireless version of its Checkout service.

Google Checkout, which launched a year ago, is a PayPal-type offering that allows users to make purchases online from partners including Toys ?R? Us, RadioShack Corp., Dick?s Sporting Goods and Starbucks Coffee Co.. Vendors with WAP sites can use the new service to consummate transactions on mobile phones.

?We?re just starting to explore the possibilities for Checkout on this new platform,? Google developer Peisun Wu posted on the company?s Web site. ?As more people and businesses engage with the Web via mobile devices, we?ll be adding further functionality to Checkout for mobile in order to help users buy the things they need quickly and securely, anytime and anywhere.?