Writing for The New York Times, David Pogue reports that the iPhone will accept SIM cards from other AT&T-sold phones after it has been activated through iTunes with the pre-installed SIM card. This will allow the immediate transfer of contacts and other information to the iPhone. SIM cards from phones sold through other wireless carriers will not work in the iPhone.
Other notes from Pogue's Q&A:
- The iPhone cannot act as a wireless modem for desktop/laptop systems
- You can interrupt synchronization in the middle of the process, and it will resume later
- To do items do not show up on the iPhone, and iPhone notes don't sync back to the computer
- The keyboard only rotates to horizontal mode when using the Web browser
- The camera lacks flash and zoom