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The iPhone 15 Pro and Index Card 3×5 are most easily told apart by their overall size. On height, the iPhone 15 Pro measures 146.6 mm against the Index Card 3×5's 127.0 mm — about 19.6 mm more. On width, the Index Card 3×5 measures 76.2 mm against the iPhone 15 Pro's 70.6 mm — about 5.6 mm more. On thickness, the iPhone 15 Pro measures 8.3 mm against the Index Card 3×5's 0.2 mm — about 8.1 mm more.
Only the iPhone 15 Pro lists a weight (187 g), so a direct comparison is not possible.
Fits comfortably in most front pockets.
Comfortable to reach all corners with one thumb.
| Metric | iPhone 15 Pro | Index Card 3×5 | Diff |
|---|---|---|---|
| Width | 70.6 mm | 76.2 mm | -5.6 mm |
| Height | 146.6 mm | 127.0 mm | +19.6 mm |
| Depth | 8.3 mm | 0.2 mm | +8.1 mm |
| Weight | 187 g | N/A | - |