Just like the iPhone 6, there are two main categories of the new iPhone 7. There is the iPhone 7 and the iPhone 7 plus. They both are available in colors Rose Gold, Gold, Silver, Black and Jet Black. They both have 32GB, 128GB and 256GB versions. They are both water resistant, and spot a 12MP back camera and 7MP front camera. They both come with the latest iOS -- iOS 10. Plus Apple has done away with the headphone jack. You now use the charging port as headphone jack or use a wireless headphone
The main difference between the iPhone 7 and the iPhone 7 plus is the screen size. iPhone 7 has a 4.7 inches HD retina screen while the iPhone 7 plus has 5.5 inches HD retina screen.
Now to price, using N425/$ exchange rate.
The iPhone 7 plus costs $969 (N411,825) for the 256GB, $869 (N369,325) for the 128GB and $769 (N326,825) for the 32GB one. While the iPhone 7 costs $849 (N360,825) for the 256GB, $749 (N318,325) for the 128GB and $649 (N275,825) for the 32GB one.