Difference between ZP/A and AA/A of 15 Pro

The first unit was originally sold in Hong Kong or Macao, and the second in the United Arab Emirates with FaceTime available internationally. You'll likely be denied warranty or AppleCare+ service on either and should get one intended for the country you'll be using it in most often.

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While Apple keeps the meaning of those letters in model numbers a secret, some resources online can offer possible explanations.

This is what Apple Inc article have to say. --> Identify your iPhone model

iPhone 15 Pro

Year introduced: 2023

Capacity: 128 GB, 256 GB, 512 GB, 1 TB

Colours: Black Titanium, White Titanium, Blue Titanium, Natural Titanium

Model numbers: A2848 (United States, Puerto Rico), A3101 (Canada, Guam, Japan, Mexico, Saudi Arabia and US Virgin Islands), A3104 (China mainland, Hong Kong, Macao), A3102 (other countries and regions)

Details: iPhone 15 Pro has a 6.1-inch1 The back is textured matt glass, and there’s a contoured-edge titanium band around the frame. The Action button is on the top left-hand side and the side button is on the right-hand side of the device. There are three cameras on the back: Ultra Wide, Main and Telephoto. There's a LiDAR Scanner on the back. There's an LED True Tone flash on the back. In the United States, there is no SIM tray. In other countries or regions, there's a SIM tray on the left-hand side that holds a "fourth form factor" (4FF) nano-SIM card. On the bottom, there is a USB-C connector for charging and transferring data.

See the tech specs for iPhone 15 Pro.