Reboot touchphone without touching the screen Sometimes touch screen on my phone is swithced off and does not switch on again. The phone is working, you can ring it, even the touch keys have light.

Can you say, it there a method how to reboot it not touching the screen?

My phone is I-Mobile IQ 5.5 (bought in Thailand).
OS: Android 4.2.2.

I've searched the phone's manual, there is nothing about this topic.

I know there is a combination of keys from other manufacturers like Samsung, but as I said here there were no word about it in manual.

Maybe there is an app, which can help me reboot the phone by pressing several hard keys?

Now, I am just taking off the battery to reboot the phone.
Pressing and holding the phone's power button for a few seconds might do the trick.

It switches off my Android phones.