We’re going to tell you how to record phone calls on your smartphone, but we strongly advise that you check whether this is legal in your region before you follow these steps. Needless to say, don’t record calls if it is illegal. If you record calls, make sure that you tell the other person that the call is being recorded.
http://gadgets.ndtv.com/apps/features/how-to-record-calls-on-your-smartphone-619766