Sellling a jailbroken iphone 4 16gb with latest version of cydia. Just had a brand new front & back screen fitted. Is currently on ee network

Benefits of jailbreak
You can download your apps from anywhere, not just from the App Store

You can use alternatives to the default apps in iOS many of which have more functionality

You can customise your phone's look and feel to suit your personality, rather than being stuck with the far more limited options in iOS

Also comes with safari+ which lets you download music from the internet
This is only available on ios 10 and higheer however because iphone is jailbroken you have the option to basically do what you want with the phone

Selling for £80 which is a good price for a jailbroken iphone