One of the feature of iPhone 6S is you can open app switcher by pressing harder on the left edge of the screen. But a new tweak is available in cydia, which allows you to open app switcher like in iPhone 6S in older devices
One of the feature of iPhone 6S is you can open app
switcher by pressing harder on the left edge of the screen. But a new tweak is
available in cydia, which allows you to open app switcher like in iPhone 6S in
older devices. ‘SB3DTouchMenu’ allows
you to open app switcher by pressing
longer on the edge of the screen. This tweak is available for free in BigBoss
repo and is compatible with iOS 9 or higher. 

If your device has not yet jailbroken, then follow this step by step guide to to jailbreak iOS 9.0.2 untethered by Pangu.
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