What is iphone 4 vs 4s?

The main difference between the iPhone 4 and the iPhone 4s is the processing power. The iPhone 4s has a faster processor, which makes it more efficient and allows it to run more applications at once. Additionally, the iPhone 4s has a better camera with a higher resolution and better low-light performance. The iPhone 4s also introduced Siri, a voice-activated personal assistant that can perform various tasks, answer questions, and provide information. Visually, the iPhone 4s looks almost identical to the iPhone 4, except for a small antenna design change on the top left corner and some minor differences in the side button placement.