I am frequent traveler between Mumbai and Bangalore. Operator told me I can book cabs for Mumbai and Bangalore in a single call. I was bit skeptical booking the cab but once is reached the Bangalore airport from mumbai, cab was waiting for me.
Since then I have used this cross city service 2-3 times and every time they have made me happy. Highly recommended if you dont want to go thru hassle of negotiating with local cab guys.