Height: 4.87 inches (123.8 mm) Width: 2.31 inches (58.6 mm) Depth: 0.30 inch (7.6 mm) Weight: 3.95 ounces (112 grams) Celular And Wireless GSM model A1428*: UMTS/HSPA+/DC-HSDPA (850, 900, 1900, 2100 MHz); GSM/EDGE (850, 900, 1800, 1900 MHz); LTE (Bands 4 and 17) CDMA model A1429*: CDMA EV-DO Rev. A and Rev. B (800, 1900, [...]

Assuming the width of the phone hasn’t changed (judging by Steve Jobs’ past statements this seems the more likely option) we can try to guesstimate the display size. After some measurements and some math we ended up with just under 3.9″ for the iPhone 5 screen diagonal, with should allow a margin of error because [...]