Mobile Number Database & Email ID database both plays a vital role to make your telemarketing campaign successful. Its really a tough task to find a good data vendor. Most of the database providers are selling very old and used data which only waste the time of telecallers. I think telecalling business is very expensive business as each and every minute counts a lot — your expenditure meter is always on just like electricity meter of your house. In that case its really un-affordable to meet the monthly expenses of your domestic call centers / international call center. You must be very analytical to buy any kind of database whether its a B2B campaign or B2C.