A3447

iPhone Duo (iPhone19,4) - Front view

iPhone Duo

iPhone19,4

A3447
A3719
A3721
A3720
View Firmware Signing Status Downgrade Status
Quick Info
Earliest Firmware
iOS 27.1
October 22, 2026
Latest Firmware
iOS 27.1
October 22, 2026
Total Firmware
1 release
Support Span
0 days
About model A3447

The model number A3447 belongs to the iPhone Duo (device identifier iPhone19,4). 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 A3719, A3721, A3720 and A3447?

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

A3719
A3721
A3720