If you want to get 3D Touch feature on an older iPhone in iOS 10 then Peek-a-Boo tweak will help you to do it. Once the tweak is installed you can press down harder on a link, a photo preview inside the Photos app, a thread in the Messages app or an email within the stock Mail app, your finger comes into contact with greater surface area and the interaction is registered by the tweak, which then allows you to take a peek at the underlying content. You can then swipe up, left and right for additional options, or press harder to have the full content pop out.
How To Enable 3D Touch Feature On An Older iPhone
Since not all iOS devices support 3D Touch, Peek-a-Boo tweak easily enables 3D Touch simulation on such devices. This tweak is not currently available in Cydia’s BigBoss repository, so to get 3D Touch feature on an older iPhone in iOS 10, you should install the tweak following steps below:
Step 1) Launch the Cydia app and go to the Sources tab.
Step 2) Click on the Edit button and then hit the Add button.
Step 3) In the text field of the pop-up that appears, type in the following repository URL:
Step 4) Press on the Add Source button and wait for the repository to load into Cydia.
Step 5) Now you should be able to search for and install Peek-a-Boo from Cydia – it’s a free download.
Once installed, you can tap and hold and then gradually smoosh your finger on your screen to simulate a 3D Touch gesture on your non-3D Touch display.
The tweak also unlocks the keyboard trackpad feature that the iPhone 6s employs for quick cursor movement and text selection, though it is quite hard to switch from cursor movement to text selection, which requires you to press harder while keeping your finger very still. Cursor movement works like a charm, though.