Apple iPhone 6s Plus
- Apple iPhone SE - housing made of 6000er Aluminium, max. 64GB internal memory, 4 inches display
- Apple iPhone 6s - housing made of 7000er Aluminium, max. 128GB internal memory, 4.7 inches display
- Apple iPhone 7 - housing like 6s, max. 256GB internal memory, 4.7 inches display
- Apple iPhone 7 Plus - housing like 6s Plus, max. 256GB internal memory, 5.5 inches display, dual camera
Remark: expansion of the internal memory is impossible - there is no slot for a memory card!
Bad enough you need a repair service if the battery dies because you can not exchange it yourself.
If you estimate your requirements wrong you can´t use your iPhone as intended, it becomes almost useless.
If you want to use an iPhone only as a luxury phone without a picture or music collection, web or camera, the 16GB version is sufficient.
But that would be a pity. If your interests change later and you want to save music collections or photo albums, you are very limited.