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Phone is lacking SIP feature.<BR>
It is one more product "limited" in functions.<BR>
For example you can setup SIP settings, but you cannot make internet call. It seems that greedy cellular companies scared from internet call freedom and forced nokia to turn off this feature in new models (N98 seems have same problem as 5800). So phone following stupid Iphone "limited functionality, what carrier likes, not consumer wants" way.<BR>

* You want to be dumb sheep? Buy this "fancy" but limited phone and pay, pay, pay for each ur breath<BR>
* Want freedom? Buy something more open. For example Nokia E51 can do SIP calls easily. And completely open is Openmoko<BR>