Uber, a company based in San Francisco, is introducing a smartphone app to New York that allows available taxi drivers and cab-seeking riders to find one another. The company said the service would begin operating on Wednesday in 105 cabs — a bit less than 1 percent of the city’s more than 13,000 yellow cabs. Uber added that it hoped to recruit 100 new drivers each week.

But the program may have a significant problem: Taxi officials say that Uber’s service may not be legal since city rules do not allow for prearranged rides in yellow taxis. They also forbid cabbies from using electronic devices while driving and prohibit any unjustified refusal of fares. (Under Uber’s policy, once a driver accepts a ride through the app, no other passenger can be picked up.)

Tags: nyc, taxis, uber