April 17 2015: Most metros  these days have  call taxi services.  The problem is sometimes you have multiple agencies in the same city  -- and it can be hassle, contacting them one by one on a busy day. 
ixigo.com   a  leading Indian online travel portal has a solution:  a new app named “ixigo cabs” which aggregates cab information and helps  you find the nearest taxis and cabs around  you from multiple operators, anywhere in India at the tap of a screen. 
The Android  app takes care of search, comparison, booking  and cancellation.  And in addition to trawling all major online cab  operators,  it  also searches  over 250 offline taxi service providers across 100 towns.