Hey guys, A few months ago I recieved an iPhone 4 that is supposedly factory unlocked. I really want to update to the newest firmware but I'm afraid of potentially loosing the unlock. Can someone please tell me if my iPhone 4 is factory unlocked? Here are the specs: Version: 4.3.5 (8L1) Carrier: Carrier 10.0 Model: MC318LL Serial Number: 61131UZWA4s Modem Firmware: 04.10.01 Note: I found a list of factory unlocked phones but a few people have told me that list isn't up to date. Note 2: My Model is missing the (/A) at the end of it.