facetime uses sms,wi-fi and other functions, but it is associated with a different class of billing,you know it is calculated different so thats just one reason some companies systems dont know how to handle it yet,they dont have provisioning and feature codes and scripting to deal with it,yet,but as it catches on companies will add this service to there lineup and will then be programmed to deal with it, others that dont offer the service will likely work on compatability as well
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