What's difference between these two and where should I use them.
For ex. That mobile is cheap. It has front and rear camera. All this makes it a good phone.
What should I use here.
All this makes or
All these make ?
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All these is not an idiom and is not used in the same way as all this.
It is better to say all these things or all these features or all these reasons.
In your example, all this is more appropriate. All this can be used to refer to multiple things, even though this implies something singular. When you use all this, think of it as meaning all this stuff.
The following examples are common and perfectly valid:
The mobile phone is cheap. It has a good battery. It has front and rear cameras. All this makes it a good choice.
The mobile phone is cheap. It has a good battery. It has front and rear cameras. All these features make it a good choice.
This is for singular whereas These is for plural. Since you are referring to both front and rear camera it is plural. Other than that, there are two cameras: front and rear. So you should write cameras instead of camera. Your final sentence would be:
That mobile is cheap. It has front and rear cameras. All these make it a good phone.