Companies are racing to provide a key service that could finally give location-based cellphone applications mass reach.
Location-based services -- programs that track users' whereabouts via their cellphones to do such things as recommend nearby restaurants or provide local weather reports -- aren't new, but developers have had difficulty bringing them to the mass market because of the complex coordination required with wireless carriers and handset makers.
Now Nokia Corp., Google Inc., and several technology start-ups are looking to solve that problem by working with the carriers and handset makers, along with other sources, to supply developers with the location ...

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