Sharp Hiptop 3 / Sidekick 3

i have seen the SK3 make and receive calls with a cingular sim card. we did not try to send a text or surf the net. Cell One did not work in it. those are the only 2 we tried. when we put the cingular sim in the phone it powerd right up and then went to the settings menu and then to the network setting(i think). selected search for network and selected cingular and it started working WITH OUT an unlock code. i hope this helps.