Why do they use stainless steel on the iPhone 4s?

Stainless steel was used in the iphone 4S for its strength, durability, and aesthetic appeal. The material provides structural integrity to the phone while also allowing for a sleek, premium look. Additionally, stainless steel is resistant to corrosion and wear, which helps maintain the device's appearance over time. Its use also contributes to the overall design and functionality of the antenna system.