I was checking out the find my phone app on ios and mac and while I can set an alphanumeric code for my iPod I do not seem to be able to set anything more than a 4 digit passcode when locking my mac or phone remotely using FindMyPhone. Is this how it is supossed to be? Also if it can only be a 4 digit code is there a limited amount of tries and what happens when that limit is reached. even with a long passcode set for an iPod, the lost most still stays at 4 digits. thanks.