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The iPhone 17 and iPhone Duo are most easily told apart by their overall size. On height, the iPhone 17 measures 147.6 mm against the iPhone Duo's 117.8 mm — about 29.8 mm more. On width, the iPhone Duo measures 84.1 mm against the iPhone 17's 71.6 mm — about 12.5 mm more. On thickness, the iPhone Duo measures 11.3 mm against the iPhone 17's 7.8 mm — about 3.5 mm more. Folded, the iPhone Duo measures 84.1 mm wide, 117.8 mm tall, and 11.3 mm thick; unfolded, it measures 164.6 mm wide, 117.8 mm tall, and 5.2 mm thick.
The iPhone Duo is the heavier of the two at 254 g, compared with 171 g for the iPhone 17. That is a 83 g difference (49%). In daily handling the difference is easy to feel.
Fits comfortably in most front pockets.
Most of the screen is reachable, shifting grip needed for corners.
Fits in larger pockets or jacket pockets only.
Best used with two hands for full screen access.
| Metric | iPhone 17 | iPhone Duo | Diff |
|---|---|---|---|
| Width (folded) | 71.6 mm | 84.1 mm | -12.5 mm |
| Height (folded) | 147.6 mm | 117.8 mm | +29.8 mm |
| Depth (folded) | 7.8 mm | 11.3 mm | -3.5 mm |
| Weight | 171 g | 254 g | -83 g |
| Battery capacity | — | 4,700 mAh | — |
| Width (unfolded) | — | 164.6 mm | — |
| Height (unfolded) | — | 117.8 mm | — |
| Depth (unfolded) | — | 5.2 mm | — |