How can I unlock an iphone 6 from T-Mobile to use with another carrier outside the US? I tried searching on ebay to buy an unlock code but I find on the web that you can't use a code to unlock an iphone and that it needs to be unlocked by Apple??? Is this true? I found a few that charges more than $100 and others that charge only $8. So, which one I should trust? With Android it was a lot easier, it was just buying a code for $5-$10 and done deal.