Smart Unlimited Calls for Twenty Pesos! (SMARTALK20)

I haven't used my Smart SIM that much since I also have a Globe number and I subscribe to its ALLTXT services daily. In fact, I was not able to consume the allowable 250 text messages to all network. But then I got tired of texting so I search for unlicall promos. I just reloaded my Smart SIM with Upsize 35 so I have enough load balance to register to daily promos. I'm not updated with current Smart promotion so I just asked Google and found this amazing offer:

ENJOY 24 HOURS OF UNLIMITED CALLS FOR ONLY P20!

Up to 6 Smart/TNT Friends!

To register, send TALK20 to 6630.

To call, dial *6630 + 11-digit SMART/ TNT number

I've called three Smart numbers already and 3 more to go. Unlimited calls for today for only twenty pesos! And to think and have only few person to call - my sister, my bestfriend, and few colleagues.

The confusing part, SMS confirmation says that promo ends on March 30, 2011. How come I was able to register and take advantage of the service? Anyway, upon checking their website, I've found that that this promo is actually good until June 30, 2011.