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The iPhone Duo and A4 Paper are most easily told apart by their overall size. On height, the A4 Paper measures 297.0 mm against the iPhone Duo's 117.8 mm — about 179.2 mm more. On width, the A4 Paper measures 210.0 mm against the iPhone Duo's 84.1 mm — about 125.9 mm more. On thickness, the iPhone Duo measures 11.3 mm against the A4 Paper's 0.1 mm — about 11.2 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.
Only the iPhone Duo lists a weight (254 g), so a direct comparison is not possible.
Fits in larger pockets or jacket pockets only.
Best used with two hands for full screen access.
| Metric | iPhone Duo | A4 Paper | Diff |
|---|---|---|---|
| Width (folded) | 84.1 mm | 210.0 mm | -125.9 mm |
| Height (folded) | 117.8 mm | 297.0 mm | -179.2 mm |
| Depth (folded) | 11.3 mm | 0.1 mm | +11.2 mm |
| Weight | 254 g | N/A | - |
| Battery capacity | 4,700 mAh | — | — |
| Width (unfolded) | 164.6 mm | — | — |
| Height (unfolded) | 117.8 mm | — | — |
| Depth (unfolded) | 5.2 mm | — | — |