Will I lose my iPhone 4S unlock if I update iOS 7.0 beta?

Will I lose my iPhone 4S unlock if I update iOS 7.0 beta?

If your unlock relies on a jailbreak tweak such as ultrasn0w, then yes when you update your iPhone to ios 7, it will remove the unlock.

However, if your iPhone is factory unlocked, then no updating to the ios 7 beta will not remove the unlock.