These are instructions on how to jailbreak your iPhone 3GS and iPhone 4 using Greenpois0n for Mac. Greenpois0n has been updated to support the iOS 4.1 and iOS 4.2.1 firmware
Apple today informed developers that starting March 27, 2019 app submissions must support the iPhone XS Max or new 12.9-inch iPad Pro and be built with the iOS 12.1 SDK or later.
The average iPhone customer is now holding on to their device for four years before updating, up from three years in 2018, according to Bernstein analyst Toni Sacconaghi.