I was just informed about this with one of my friend when he ran out of load and suprisingly it works.
You can actually get 4 Smart free load which is good for 1 day free. You can use this during emergencies that you need to. The bad thing is it will be credited the next time you top up it will be deducted to it.
What you need to do:
just dial *767
you will hear like a beep on your phone then the call will get cut off. (that's normal as it processess the and the VDN is actually reading your phone number)
wait for the text telling you that you have 4 text credits and it will tell you that they will be deducting it on the next payroll.
Fair enough, right?