Sprint has acquired Handmark, reports AllThingsD. Handmark is a mobile app and services company perhaps most well known for its Pocket Express app for Palm smartphones. In recent years, Handmark has turned toward mobile advertising, and it is this expertise that attracted Sprint's attention. "As a long-time partner of Sprint, we've worked together on some of the mobile industry's most successful initiatives," said Handmark founder and CEO Augie Grasis. "Joining forces is a natural progression to our relationship and will help scale our mobile media business." Sprint will put Handmark's assets to use with its Pinsight Media advertising unit.