Despite their excellent brand image, Apple is truly a close-source minded company. We all know about iTunes and the use of DRM, now it’s the iPhone turn: if you purchase an iPhone, good luck to use it with another phone operator than AT&T, or even use for its basic features (camera, wifi…). If you are outside the USA, it’s still worse: while you can easily order an iPhone on eBay, you have to wait they decide that European people can enjoy the iPhone too. The good news, is that smart people are working legitimately to circumvent these awful practises. As a result, “DVD Jon” already posted how to unlock the iPhone and use its basic capabilities (such as Wifi access and iPod player). Others are already providing ways to access the iPhone and modify it (and they need help!). The next step is to get support for any SIM card, which will let iPhone owners to just… use the iPhone as a cell-phone! And don’t forget the Nokia N95.
I’d say don’t forget the Neo1973 :
http://www.openmoko.com/
This one is truly open source, and available soon (October this year), or actually already available for developers now.