Im guessing you mean iphone unlock sites or something, but it has an illegal conotation no matter how you look at it, im going to say the plural would be better, phonepasswords.com, that is assuming it's not phonespassword.com !
Please tell me it's not that?
Has development potential, but the niche is way crowded. I have no value other than to say phonepasswords is worth more than phonepassword.