i'm in love with this phone and the unlocked features so far. when the phone is finally unlocked i'll put my t-mobile sim in. when i use the voicemail feature on my treo 680 (an unsupported t-mobile device) my voicemail still works once the sim is in. there's an 805 area code number that the phone dials into for the mail here in the los angeles area. why wouldn't it be the same case for the iphone once it's unlocked.