Hey /g/ I need some help figuring out a solution for finding

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Hey /g/ I need some help figuring out a solution for finding phone numbers for people. Essentially, I have about 100 spreadsheet with roughly 400,000 people in total on them and each individual has their last known address, city and state along with previous employer but no phone number. What I need to do is find a way to contact these people and obviously a phone number is the easiest way to do that.. but who the hell really has landline phones anymore? I know there's services like whitepages pro and shit like peoplefinder but a lot of these look like cookie-cutter services of each other and all of them have a pretty redonkulous cost (something like $50 a month for 200 searches providing only basic info, or 10.00 for an extensive background and contact report per person). I just need to find out what company or service out there that is most reliable in finding a current phone number or contact information for someone using only their first/middle/last name and previous known addresses that doesn't limit how many searches you do if you pay for the membership. Anyone have any experience with this?