It's unlikely that the iPhone 16 will be on sale for Prime Day since it's so new, so you're more likely to find that the iPhone 15 will see a discount on Prime Day. The iPhone 15 was released in September 2023, so by Prime Day 2024, it will be about a year old. This makes it a prime candidate for discounts and promotions. Carriers like Verizon, AT&T, and T-Mobile often have their own Prime Day promotions, which could include deals on the iPhone 15 with a new plan or upgrade.