contact->open menu, setting->display preference->configure contact list->select google contact only

you can use the volume button bro...

Im using app called Gravity Screen

Does your flip case has hole at the proximity sensor there?

go to setting - button - wake up with volume button (enable this)

Optionally, you could buy the Mikey as an alternative wakeup button. Its also replaceable when spoiled.

Oh btw u must change the app to TRUST and AUTO START, if not it will not work.

Have been using the app for about 2 months and never drain battery at all.
Must been becoz ur setting are wrong coz its not working properly.

I'm using Gravity Screen.
Need to goto Settings -> Apps -> Gravity Screen -> change to trust and auto start

U mat refer to my setting. So far im using it no prob.

I tried Gravity Screen before. U will have to close your flip case AND tilt ur phone downwards. Then only the screen will off. Tilt ur phone downwards as in 60%, the pocket sensor thingy's measurement. Just terbalik ur phone upside down + flip ur case. THen only it will screen off.

Hmm i dont want to auto off when put on table so i didnt on it.
U should enable Lying Face Up.
I tested working perfectly.. put on table after 1.5secs screen off already.

And i dont use flip casing..
What i do is just put my thumb on the sensor and it will auto wakeup. U can try whether works or not.
So if i put my phone on table and want it lock it, i just put my thumb on the proximity and it will lock (but still showing locked screen) then after 1.5sec then only it will totally off screen.

After putting ur thumbs on the proximity sensor, u nid to have slight motion, just move ur phone a little. THen it'll lock screen. 

Mikey don't really work well with my mi3. need to press more than once just to wake up the phone. sometimes more than thrice. when trying to turn the screen off,  it instead increases the volume. don't know if my Mikey is faulty or what...