According to Behold 2 user manual, sounds as though UMA should be supported: "Once set up for Wi-Fi connectivity, your phone automatically uses Wi-Fi, when available, for all your mobile phone services." Unfortunately, I can do everything EXCEPT make and receive calls. When placing a call, error is "Not registered to the network." It's not a router issue, because I have a Blackberry Bold 9700 for which UMA works seamlessly. Does anyone have this working on the Behold 2? Am I missing some obscure set-up option to make UMA work?