How to use standart phone Call system as tell: by web

Hi guys how i do my app call from phone in my number or else, like tell: +823981294;

First you need to decide the platform IOS/Android.Second you need to read about the services that this Platform provide.On IOS its simply by doing this Objective-C call.

[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@“tel:12125551212”]];