I think the answer to this should be yes but I never tried it. I just want to use my iPhone SIM on my HTC touch HD that came today to test if it will make calls, tether, etc. Is there any reason I can't do this? I am on O2 UK if that matters.
Is it even possible to lock a sim into a particular phone model, so it couldn't be used in another phone, even if that phone was locked into the same network(or unlocked)?
Yes. In the US, you can only use a SIM in an iPhone that was activated in an iPhone on an iPhone plan. You can put that SIM in other (unlocked or AT&T) phones, but you cannot put another (AT&T) SIM into an iPhone and have it work.
(disregarding unlock/jailbreak situations)
I disagree, Had my Motorolla razr for...2 years occasionaly switching with an N91.. My cousin gave me the iPhone this past August. I just put the SIM in and activated, and it worked fine.
That means that one unhappy man, 2 iPhones and a MBP are going to go see the people at the Apple store for replacements.
Good luck Ryan...![]()