Preferably from Apple. I am looking to upgrade my 6 plus to a 6s plus, and I'd love to keep my jailbreak. Anyone know what iOS 128GB iPhone 6s's may be shipping with?
It totally depends on how long the phone has been sitting at the store. Some come with older software due to having been at the store longer. The newer ones usually come with the latest software. It's no real way to tell without purchasing one.