Hi, I've been wondering if it is possible to change iPhone 6 IMEI. I read that it is possible for 4.6 firmware, but mine's on 2.41. If the answer is no, I would also like to know if the iPhone will work on any other country (I'm from Puerto Rico). If I sell it, will it work outside of the country, even though AT&T got it blacklisted here?
Thanks!