I don't know why my Redmi 3s phone switch phone automatically? | Redmi 3s Prime not switching on

Solution 1:

Follow the steps to enter Recovery Mode XIAOMI Redmi Note 3

1. Start by holding down the Power key for a short while in order to turn off the device.
2. in the next step press and hold the Volume Up + Power button for a couple of seconds.
3. As soon as the Mi Logo appears on your screen release you can release both keys.
4. Well done! You are in the expected mode.
5. You can navigate here by using the Volume buttons and confirm options by pressing the Power key.
6. Once in recovery mode please select wipe and reset.

Solution 2:

First you enter sim card on your smart phone.

Then after power button press for 10-15 second,and your problem is solve.