HTC One X Quick Start Guide - Page 30
Wi-fi Calling - mobile phone
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Wi-Fi Calling IMPORTANT: Wi-Fi Calling requires that you use the SIM card that comes with your phone. A different SIM card will not work if you want to use Wi-Fi Calling. Also, you must register your address for 9-1-1. Wi-Fi Calling will not work until you have registered for 9-1-1 by logging into your account at www.t-mobile.com. Go to your profile and click Customer Info. About Wi-Fi Calling Wi-Fi Calling can improve your coverage and allows you to make phone calls and send messages over a Wi-Fi network (when a Wi-Fi network is available). Unless your rate plan provides otherwise, Wi-Fi Calling minutes count the same as T-Mobile cellular calling minutes on your phone bill. n To use Wi-Fi Calling, you must first turn on Wi-Fi, connect to a Wi-Fi network, and then turn on Wi-Fi Calling. n When the Wi-Fi Calling feature is on, your phone displays the Wi-Fi Calling icon on the Status bar. 18