Yes, the iPhone 4 and 4s models are the same size so all cases and screen protectors will fit the same.
Same size as the iPhone 4's (9 cm aka. 3.5 inches)
No. If you want your phone to have a screen about 4 times the size, buy an iPad.
The iPhone SE has a 4-inch screen (3.48" by 1.96").
as about the size of a iPhone or a iPod
4.7 inches.
320 by 480 pixels
4.7 inches.
The iPhone 5 is 123.8 mm (4,87 in) high, 58.6 mm (2.31 in) wide and 7.6 mm (0.30 in) thick. The screen is 101.6 mm (4 in) across the diagonal
You can't but if you break you iPhone screen like I did, when you go to repair it they don't fix the screen they replace your iPhone and it will be jailbroken.
neither, same size
The following 4 ways can help you to repair your iPhone Stuck on Black Screen: 1.Fix iPhone Black Screen Problem with TunesKit iOS System Recovery Step 1, Connect iPhone to the computer Step 2, Download frimware package Step 3, Fix your iPhone 2,Fix iPhone Black Screen Problem by Hard Reboot 3,Restore iPhone to Factory Setting to Fix iPhone Black Screen 4,Seek for Apple Genius Bar to Fix iPhone Black Screen