Check where and when's your iphone made of easily by checking the iphone's serial number. Useful guide if you are looking to buy second hand phone.
3 Ways to Find Your Mobile Phone's Serial Number Without Taking it Apart
How to know when my iPhone was manufactured? How do I know that from those words in serial number - Quora
Finding Your iPhone Serial Number [Step-by-Step Guide]
How To Get Apple To Replace Your iPhone: Your Rights Explained
Locating Your iPhone Serial Number
Hidden code tells if your iPhone was new or refurbished
100+ Secret Dialer Codes for Your iPhone « iOS & iPhone :: Gadget Hacks
Solved] What is iPhone Demo Mode & How to Remove It?
My iPhone Says No Service. Here's The Real Fix!
How to find out if your iPhone is original or fake
How to check if your iPhone is original or not: 10 Ways to identify - iGeeksBlog