Use APKPure App
Get Floating Dialer old version APK for Android
Gecko Dialer puts your dialer at the top of your screen
Gecko Dialer puts your dialer at the top of your screen.
With Gecko Dialer, you can place a call, while reading the phone number in another app.
Similar to Facebook chatheads and other bubble launchers, Gecko Dialer provides you with a unique multitasking experience. You can use your dialer from any app on the device.
Kudos to the guys from Tooleap for their SDK that I used for creating the floating dialer window:
www.tooleap.com
Use Gecko Dialer to see your recent calls, or use T9 search to browse through your contact list.