I called Sprint to verify if my iPhone 4S has been unlocked for international use. They said, it's UNLOCKED. However, they told me if I decide to upgrade to iOS8, it will automatically lock the phone. Is this true? I'm giving my aunt my 4S. She's lives international and won't have a need to use it here in the USA. I thought once the phone was unlocked for international use that it was unlocked permanently. I'm sure I've done a couple software updates on this phone and clearly, I was told it was 'unlocked' after I made the verification call today. I don't understand, if ever, my aunt, decides to update to iOS8, that it would lock the phone and she would never able to use it. I'm canceling my service with Sprint this weekend and I want my aunt to be able to use it in her home country. Can I remove the Sprint Sim and just send her the phone? Or will she need it? Thanks.