According to my experience, there is a no legally way to buy a list of phone no. but if you are from India then you can find categories, city wise from JUST DIAL, here you find all contact with their address and it helps you to grow your business. If you buy from somewhere then it’s not guaranty they all no. is correct. So, I suggest don't buy from anyone
Once you've collected your mobile numbers, verified that you have followed all of your legal responsibilities you can start your SMS marketing campaign. I'd suggest using a 3rd party service provider to ensure that you are able to track the return on investment for your campaign, embed an unsubscribe message, and easily manage your SMS marketing database including unsubscribes. 
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