How to tell a 4s or 4 iPhone?

How to tell a 4s or 4 iPhone?

Hold the bottom left corner of the phone with your palm for 30-60 seconds (without a case). If the signal drops by 1 or 2 bars, it's a 4. If it dosent it's a 4s.

Hold the home button, if Siri pops up you have a 4S

-the iphone 4s has 4 lines on the sides (two lines on each side) (antenna "breaks")
-also the iphone 4s model number is A1387 you can see that number in the back of the iphone.
-iphone 4s has siri iphone 4 does not!
-the model number for iphone 4 is A1332 or A1349.
-the iphone 4 has only 3 lines on the sides (antenna "breaks")

Hold the middle button. If siri pops up… It a 4s if not its 4.

Press and hold the home button for like 3 seconds and if Siri pops up, it's the iPhone 4S. If not, it's an iPhone 4.