how to call village parents at free of cost offline

i am reddyprasad,and i am using net in my lap and my parents not that much educated and lack of internet knowledge and using JAVA basic MOBILES

BUT I need to call and chat with my mom AND dad

how?
how?
how?
how?

is it possible....................................................ya OFCOURCE

there is a wayyyyyyyyyyyyy

you can call by using this link

http://www.numbertank.com/



advantages:

its my account in nubertank.................

see that

here am explaining clearly about nubertank