According to a recent study by ABI Research, converging landline and cellular access will succeed in Europe first because the convergence technology is more amenable to GSM and 3G systems. The only convergence technology that is set to be widely available is called UMA technology. UMA enables seamless hand-offs between cellular and Wi-Fi networks. Since UMA technology is designed for GSM-based cellular networks and virtually all European cellular networks are GSM, the study concluded that Europe will adopt fixed-mobile convergence quicker than any other regional market. Cingular and T-Mobile use GSM technology in the US.
For more details on ABI Research's FMC study:
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