Here’s the basic idea. If you’re willing to pay $10 a month on top of a regular T-Mobile voice plan, you get a special cellphone.But when it’s in a Wi-Fi wireless Internet hot spot, this phone offers a huge bargain: all your calls are free. You use it and dial it the same as always — you still get call hold, caller ID, three-way calling and all.In other words, if you have a wireless router at home or at the office, all your calls would be free and would not use any of your minutes. If you’re at Starbucks, your calls are free, etc. The only time it can’t call out over a Wi-Fi network is if you’re at a place where you have to initiate through a web page first (like a hotel). But then you would use your regular minutes.

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