In 1997, Sculley co-founded PopTech with Bob Metcalfe and several other dignitaries from the technology industry. In 1998, he joined the board of directors of BuyComp LLC (now Buy.com), an Internet-only computer store. Two years later, he partnered with Dennis M. Lynch to launch Signature21, providing marketing services to small to medium-sized businesses. In 2001, Sculley and Lynch transitioned the company into a learning program for rising entrepreneurs. Months later, Lynch left the company, while Sculley continued to consult and work with small businesses, including InPhonic, whose board of directors he later joined. InPhonic was an online retailer of cell phones and wireless plans. Sculley's early leadership helped steer InPhonic towards its successful IPO in 2004. Sculley served as the vice chairman of the InPhonic board of directors. InPhonic filed for bankruptcy in 2007.