Here r the steps:
First register here with ur email id.
http://promotions.pennytel.com/xpromo/website_landing.html
Then Check ur mail for id and pasword.
Using Handler application(ucweb or opera orany)
Go to http://www.pennytel.com/m
Sign in with your id and pasword given in your mail.
It wil show, "Balance : $0.00" But NO PROBLEM guys.
Just enter
"From" - which cell u want to make the CALLER
"To" - whom u want to accept the call here itcomes
.
.
.
U r connecte via "call-back method"
That's it.