The Apple iPhone 6 Plus has a better battery life than the Apple iPhone 6.
The first iPhone was bulit on January 9, 2007.
An IPhone 7
Yes, iPhone 6 and 6s are interchangeable as far as cases go.
iPhone 6s plus
Plus 3T
Yes, the EarPods with a Lightning connector are compatible with the iPhone 6s Plus. However, since the iPhone 6s Plus has a 3.5mm headphone jack, you would typically use standard EarPods with a 3.5mm connector. If you want to use Lightning EarPods, you would need a Lightning to 3.5mm adapter.
Depends on which iPhone you buy. iPhone 5s comes with 16 or 32GB of storage. iPhone 6 & 6 Plus comes with 16 or 64GB of storage iPhone 6s & 6s Plus comes with 16GB, 64GB, or 128GB of storage.
It's your phone - only you know that information !
You can check the model number on the back of the phone or in the settings menu to determine if you have an iPhone 6 or 6s. Additionally, the iPhone 6s introduced 3D Touch technology, which the iPhone 6 does not have.
iPhone 6s comes in two storage variants which are 32GB and 128GB.
The iPhone that comes after the 6s is the iPhone 7, which was released in September 2016. The iPhone 7 introduced several new features, including improved camera capabilities, water resistance, and the removal of the headphone jack. It was followed by the iPhone 7 Plus, which offered a larger display and dual-camera system.