I have a new E70 and it is a splendid device. I use it to make calls with my Irish service provider, Blueface. Unfortunately, people cannot phone me on my VoIP number, which means they can only call me on my mobile number, thereby paying more given Ireland's high calls-to-mobile charges.
Apparently there is a problem with the E70 accessing my ISP's SIP system. There is discussion about this here. Evidently the E61 had a similar problem, which may have been fixed by the 3.x version of the E61's SIP software.
Will Nokia be updating the E70's SIP software soon?