DEAR all ,Basically we are from BPO (Domestic) company who sale Insurance products through telemarketing we have crores and crores Cell mumbers which has to be filterd like inactive numbers ( not in use numbers,not existing numbers) and active numbers(Live numbers)hence we need web based application (software) which can filter like this and also we want again the active numbers shouldbe filtered in service providerwise like AIRCEL,AIRTEL,BSNL, pls chat with me if you need any clarification But one is sure in MUMBAI already there are some company is there who use this application -expecting quote from people who aware of this concept so that we can start this project immediately .