One of the things that are annoying about making a phone call, other than having to make the phone call of course is when you have to hold your iPhone to the ear and keep listening to see when someone picks up the call. This can get tiring too when the other person is taking their time to pick up the call, while you have other things to attend to.
A jailbreak tweak called LetMeKnow is here to help. With this hack installed your iPhone will literally let you know when the person you are calling has picked up the call by playing a subtle vibration. The tweak’s functionality does not stop there though as it will also tell you when the call has ended or disconnected by vibrating the device right at disconnection. So with this tweak installed you can dial a number and conveniently hold the device in the hand without having to worry about other person receiving and waiting for you.
LetMeKnow tweak has been tested on iPhone 7 running iOS 11.1.2 and several users with iPhone X have reported success with the tweak as well. You can download it for free here from GitHub. Since Cydia is not on iOS 11 yet, you will have to install the .deb file manually.