You can...
i thought it was confirmed b4 that u were allowed to switch the iphone sim between phones?
You can switch the SIM to any other phone no problem.
But, if you try to use data (on the other phone) you will run into problems. While I'm sure you will be able to USE it, you will have to pay for it dearly.
The reason I inquired with ATT is because I use an excellent unlocked HTC device with Windows Mobile 6. I'd even like to buy an LG Prada at some point, which I can use if unlocked no prolem.
I use a LOT of data each month with it. If I want to switch between iPhone and my WM6 device, the data plan will not cover data I use when not on the iPhone.
That's the way it was explained to me numerous times, with the main post in this thread as the official from ATT customer service. I don't want to be tied down to one phone just because it's the iPhone.
I am an ATT customer because I enjoy the freedom of being able to switch phones and take my unlimited data plan with me just by popping the sim in another phone, 3G etc. No other carrier in the US allows you to do that! No single phone has everything I love--even the iPhone lacks features that I really enjoy, I don't need to list those.
To be paying for data, but unable to transfer it between devices that I am supposed to own is not fun for me. That's why I started this thread.
Here's the issue though: The iPhone data plan is 20 bucks unlimited. I pay 34.99 per month for unlimited PDA data. I pay MORE so I would think that ATT would be willing to allow me to pay more, keep my PDA plan, but use the phone I want to use, iPhone or otherwise.
I don't mind paying 14.99 for the real freedom to switch between phones and use all of the features of each. To me it's worth it but now, as an ATT customer, I feel as though they are limiting me. If profit was really their main interest, they'd let me pay more for what I want but there's something else going on--server issues, data limitation or otherwise.
It may change. They may open things up for customers depending on how well the thing does. We'll see.