every mobile operator provides premium nos. the premium mostly depends on the last digits, for ex my both nos have last 4 digits same preceded by same 3 digits for ex: 8889999. these type of nos now a days costs arnd 50k in vodafone. another thing is,these nos get booked very fast,typically within 1-2 days of launch.one has to go the respective operators store to get the nos and the rates. one more thing,one has to pay 10.3 % service tax on the premium no.