IPhone 7 lock that prevents individuals from attempting to replace the home button on their own. Users are now required to go to an Apple Store to have repairs done, with "recalibration" of the button being necessary. This is a step further than Apple went with iPhone 5S, 6 and 6S, where only Touch ID functionality would get disabled but the "return-to-home" functionality still worked. Some iPhone 7 devices with the model numbers A1660, A1779 and A1780 suffer from a problem where they show a "No service" message even when cellular reception is available. Apple will repair those devices for free within
IPhone system. The iPhone was initially released with two options for internal storage size: 4 or 8GB. On September 5, 2007, Apple discontinued the 4GB models. On February 5, 2008, Apple added a 16GB model. The iPhone 3G was available in 8 and 16GB. The iPhone 3GS came in 16 and 32GB variants and remained available in 8GB until September 2012, more than three years after its launch. The iPhone 4 was available in 16 and 32GB variants, as well as an 8GB variant to be sold alongside the iPhone 4S at a reduced price point. The iPhone 4S was available