A1633

iPhone 6s (iPhone8,1) - Front view

iPhone 6s

iPhone8,1

A1633
A1688
A1700
A1691
View Firmware Signing Status Downgrade Status
Quick Info
Earliest Firmware
iOS 9.0
September 16, 2015
Latest Firmware
iOS 15.8.8
May 11, 2026
Total Firmware
116 releases
Support Span
10 years 7 months
About model A1633

The model number A1633 belongs to the iPhone 6s (device identifier iPhone8,1). 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 A1688, A1700, A1691 and A1633?

Nothing software-related. These model numbers all refer to the same iPhone 6s; Apple uses them for regional and connectivity variants, and firmware support is identical across all of them.

A1688
A1700
A1691