Send Free Message Through Zong:
Hi Friends, from this trick you can send free message through Zong Sim.
In that case when your message package and balance is over you can send free message.
Just Dial *100# and then press call button.
A menu will appear, select Call me back option by dial 1.
After that enter recipient number and press send button.
By this a free Call me back message will send to recipient.
Please don't abuse here,