If you have a UMA enabled smartphone then take advantage of the now free Wifi calling. Blackberry Bold 9700/9780, Blackberry Curve 9300 and the Blackberry Curve 8520 can all use this feature.
“T-Mobile is excited to expand our Wi-Fi Calling feature, a unique and valuable service T-Mobile has been offering customers for over three years. Starting today, T-Mobile customers can add Free Wi-Fi Calling to their rate plan – at no additional charge – to place calls over Wi-Fi without deducting from their allotment of minutes. This new feature is available at T-Mobile retail stores to all customers on Even More and Even More Plus Postpaid rate plans who have Wi-Fi Calling capable handsets.”