#1. Reject calls with a text
On most Android phones, this option is available in the phone App > Settings > Call blocking > Quick responses. You’ll see the call reject messages like “Can’t talk now, What’s up?”, “I’ll call you right back”, “I’ll call you later”, “Can’t talk now, call me later?” or you can edit custom message with your own writing style.
#2. Quickly open the camera
Nexus 5X or Nexus 6P: double-tap power button.
Samsung devices : double-tap the physical Home button.
LG V10: double-tap the volume down button.
Moto G 2015: twist your wrist with the device in hand.
#3. Bypass unlocking your phone
#4. Add Contact Widgets
Press and hold on your Home screen, choose Widgets, and then look for the Contacts 1×1 widget. Tapping this shortcut loads a contact’s details, letting you call, text, or email without scrolling through your address book.
#5. Enable “OK, Google” Everywhere
#6. Refresh a Webpage
#7. Do not disturb mode
To take screenshot, Just press hold the power and volume down buttons until you hear the “Click”. In Android 6.0 Marshmallow, Press and hold the Home button to launch Now on Tap, then tap the Share button to the left of the Google button.
In Google keyboard, tap the “?123” button to get special character and number. If you want to capitalize a letter beyond the first character of a sentence, just double click on the caps-lock key (the up-facing arrow to the left of letter z). Long-press any number in Google keyboard to get a pop-up list of common fractions involving that figure.