ABI Research expects cellular-based femtocells to outpace UMA and SIP-based WiFi solutions by 2013, grabbing 62 percent of the market. According to Stuart Carlaw, vice president and research: "Although UMA-based WiFi solutions have seen early gains in greenfield markets, these solutions have not proliferated much outside their current carrier footprints. This can be attributed partly to the carriers' desire to assess femtocell developments, but also to lingering concerns regarding the concept of WiFi-based fixed-mobile convergence." Article