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To my knowledge, there isn't a way to target new phone purchasers. Facebook may have some more specific targeted user groups than Bing or Google, but even the content network doesn't have something that specific at this point, unfortunately. What market are you specifically looking to grasp? Maybe it's not new users, but people who are nervous about breaking their phone? Or who are looking to upgrade that might not know what the best choice is for them? There are ample numbers of ways to target mobile users more specifically with Facebook and twitter than with adwords and bingads.