Mobile messaging platform provider Waterfall Mobile has secured $3.7 million from undisclosed investors according to a regulatory filing, reports Venturebeat.com. The San Francisco-based company founded in 2005, is also trying to raise an additional $4.6 million for a total of $8.3 million in this current round. In the past, it’s been backed by Vista Equity Partners, though no word if they are coming back in this round. Waterfall Mobile has two main products: Mesgme, a mobile messaging platform, aimed at giving marketers and media companies the ability to deliver targeted mobile ad campaigns, and a mobile messaging platform called AlertU aimed at delivering emergency notifications.