I have a iPhone 5 and have had trouble for months. I finally reset my router and the call feature started to work. I then went into the router to put in a password and upped the security settings from the standard settings caused by the reset and my iPhone would not work again. I went back into the router and put the security setting to the standard mode and my iPhone worked again. Not sure if this will help you but you can give it a try if you have adjusted you router settings.
i am not happy with having the security setting at the standard mode but it seems to be the only way to get my iPhone to work with the connect app. The text and everything else works at a higher security setting but not the call feature...hope it helps.
I am still looking into my issue as for what I am paying a month and trying to deal with their online chat trying to reach them by phone is a pain! Good luck.
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