[Android Central Question]

It is a gionee m2 phone and operating on 3g network

[belodion]

What do you mean by the “call” icon?

[Rukbat]

If you mean the "phone" icon, go into your app drawer, fine "phone", long-press it and drag it to your home screen. (You may have to move it a little first, to see the home screen.) Then when you're back to the home screen, put it where you want it. (It's usually on the left end of the dock [at the bottom of the screen].)