Hello everyone. I recently purchased an new iphone 6S online to replace my cracked 6. It was advertised as being unlocked but when i tried putting my sim in, I could not get it to activate. Ended up calling apple who said the device was sim locked to Sprint. My family uses ATT so right now this phone is useless. Is there a way to factory unlock this device so I can use it with ATT? A quick google search turns up a bunch of sites offering "factory unlock" of the phone but I can't tell if they're real or scam sites. Any feedback is much appreciated, thanks.