A new study by market research firm In-Stat finds that within the next four years WiFi GSM phone sales will take off, with more than 132 million devices having WiFi and cellular capabilities.

"In the end, most US cellular carriers will embrace Wi-Fi in their handsets, as carriers know that if they don’t, other carriers will, and these carriers will likely steal away some of their customers," says Allen Nogee, In-Stat analyst.  Combo handsets also offer carriers opportunities to provide services such as VoIP over Wi-Fi, lessening impact on their cellular data system.

ogl