I always use this taxi service whenever I am in india From Ooty Taxi Fare .com 

  ooty cab service , All my airport trips are taken care by their service . We personally had an Excellent experience in case of service , the cars are very clean & mostly important is its very reliable & safe for ladies & families .The car also has a GPS service which will be shared on our request .
Most of his Taxi has facilities like WiFi , chargers , bottle of water . These services the taxi never charged me anything extra,

best taxi service in ooty