Sponsored lock screens pay for free calls

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Advertisers are always looking for untapped surfaces to fill with ads, and consumers can often reap the benefits. We have already seen Add My Window enable Dutch residents to rent out their public facing windows to advertisers. Elsewhere, Screen Donor is a free app that converted the lock screen of dormant smartphones into free, untapped ad space for humanitarian organization Doctors of the World. Now, a brainchild of two ex-Google managers, PopTalk converts that same concept into a mutually beneficial customer-business relationship: the web application provides free international calls, texts and prepaid data in exchange for filling the user's lock…

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