What is the newest iPhone? - At the moment, the newest iPhone is the model - iPhone Xr. This model is available in several configurations and colors. You can choose a model with a storage size of 64GB, 128GB and 256GB. Despite the fact that iPhones is an expensive product, this model has a relatively reasonable price. Prices start at $ 699 for the 64GB version. Here read more about iPhone Xr.
Next model is iPhone Xs and iPhone XS Max. These are the two main flagships from Apple in 2019. You can choose a model with a storage size of 64GB, 256GB and 512GB. Do not forget that these iPhone models are the most powerful from the Apple, but also the most expensive. The price depends on the region and taxation and starts from $999 for iPhone XS 64GB and from $1099 for iPhone XS Max 64GB. Here read more about this smartphone.
P.S. Apple for a small additional fee, makes it possible to change the iPhone every year. When buying a new iPhone in a store, I recommend to learn more about this service.