You can use this tweak to mess around with the roundness and corner radius of the dial pad buttons until they match your own personal tastes.
After you install PhoneDialReformer, you can open the Settings app and launch the tweak’s preferences pane:
There’s not a whole lot to configure here. There’s just a toggle switch to enable or disable the tweak on demand, as well as a slider to adjust the amount you want to reform the buttons by.
The slider can be used to choose a value between 0 and 25. As you move the slider, it changes the shape and corner radius of the dial pad buttons. We’ve found that setting the slider to somewhere in the middle yields the best visual results.
Changes are immediate, so you don’t need to respring every time you make a change. Nevertheless, we recommend killing and re-opening the Phone app any time you make changes for the best results.
You can get the tweak for free from the Cydia store via BigBoss repo, download and install it on your device and let us know your opinion about it.