Free Sms trick for Docomo using Buddynet Service at 0 balance

Sms 'JOIN' Send to 121
you recieve confirmation message and then Sms 'QUIT' Send to 121 you recieve confirmation message .
Now check your balance Sms 'BAL' Send to 121 you see your local/national balance is 50 validity 1weak.
Note koi bhi balance detuct nahi hoga.