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I'm uncertain about one thing regarding your question. Are you currently capturing their phone numbers and just looking for a way to automate the process of separating conversions from non buyers? Or are you asking if there is a way Google analytics will retroactively provide you that information? If it's option 2 the answers no, however automation of conversions and producing a email/SMS list from leads based upon a point system of you own creation, real time tracking with or without javascript, Unlimited list size for your email captures, landing pages every single thing a marketer needs for 100% free, look into Mautic. g-tTM0fNZyQ