I just tried taking my NTT Docomo Foma (3G) SIM out of my F900iC and put it in my unlocked Nokia 7600 which is also a 3G phone. The SIM worked fine, but I couldn't send international SMSs. When I put the US T-Mobile SIM into the F900iC, it said "please insert your Docomo SIM". So obviously, the phone is locked. The question is, is there a way to unlock it? And, is there a way to use it on foreign networks. The Good news for Docomo users is that it appears Docomo now has roaming agreements so you can keep your Japanese phone number overseas, but the big question for gadget freaks is if you foreigners can use the new swanky Docomo phones. ;-) I'll look into it, but if anyone has any info, let me know.