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The new wireless service - which has been undergoing trials in Seattle for about the past two months with a group of about 300 users - lets T-Mobile’s subscribers make free phone calls using their at-home WiFi network or from any number of public WiFi hot spots which have been set up throughout the city. For now, only subscribers using theNokia ( News - Alert) 6136 and the Samsung (News - Alert) T709 dual mode phones can place free calls over WiFi.