Hi again, If you want to have a closer look try
http://www.NokiaHowTo.com
you can select any of their models and use ineractive demo to see them close up, and see how they work..
If its your phone number you want to keep, then you can have it swapped to the new sim easily,
just ask you current network for a PAC code and then you can take you number with you
or as Pingu says have the new handset unlocked and keep your same network, it's about �5
I always have sony ericsson which are not the simplest of phones, but i like lots of features...anyways, check around the nokia site to see if any are suitable...hope this helps!