A1533
- Earliest Firmware
- iOS 7.0.1
- September 18, 2013
- Latest Firmware
- iOS 12.5.8
- January 26, 2026
- Total Firmware
- 89 releases
- Support Span
- 12 years 4 months
The model number A1533 belongs to the iPhone 5s (GSM) (device identifier iPhone6,1). Apple assigns multiple model numbers to each device for regional and connectivity variants, so one device usually carries several of them.
How do I find the model number on my device?
Open Settings > General > About and read the Model Number field. The number is also printed in the fine print on the back of the device and, on some models, on the SIM tray. Our model identification guide walks through every method.
What is the difference between A1453 and A1533?
Nothing software-related. These model numbers all refer to the same iPhone 5s (GSM); Apple uses them for regional and connectivity variants, and firmware support is identical across all of them.