Question: how do i know how many gb my iphone has without turning it on?
Answer: You can also find the capacity of your iPhone with an IMEI lookup, which is a good option if you can't power on your iPhone and the capacity isn't printed on the back. You'll find the IMEI printed on the back of the original iPhone and the iPhone 5, 5s, 5c, SE, 6 and 6 Plus.