sentences:  In February 2009, Loopt expanded service again to select AT&T phones, making it the first service since SMS available across all major networks.In October 2009, Loopt acquired Y Combinator-backed startup GraffitiGeo for an undisclosed sum.In March 2010, Loopt launched an upgraded version of its iPhone app, incorporating place and event information to its Pulse database, bringing in content from ZVents, Metromix, and SonicLiving.