I have been wondering about the exhaustability of recharge PINs. Let me use MTN as an example: an MTN recharge PIN has 12 digits (xxxx xxxx xxxx). That means there are nine hundred and ninety nine billion, nine hundred and ninety nine million, nine hundred and ninety nine thousand, and nine hundred and ninety nine combinations of recharge PINs (999 999 999 999).

My question is, what if over the years, this limit is reached, would MTN expand the number of digits of her PIN? Or, would she start reproducing already spent PINs so as to still keep the digits at 12?

You permutate the 12 digits right, even if it is reached MTN will still continue, thats why if someone load a card now,it can still work 2 years later, until maybe lets say 10 to 15 yrs from now there might have been improvement in technology, recharge card may be printed in another way,

I wonder if fore-casting guarantees; i.e. if somebody does try yur luck and gets a recharge, what will happen if another customer buys d recharge card dat has been fraudulently used¿

charlsecy4:

I have been wondering about the exhaustability of recharge PINs. Let me use MTN as an example: an MTN recharge PIN has 12 digits (xxxx xxxx xxxx). That means there are nine hundred and ninety nine billion, nine hundred and ninety nine million, nine hundred and ninety nine thousand, and nine hundred and ninety nine combinations of recharge PINs (999 999 999 999).

My question is, what if over the years, this limit is reached, would MTN expand the number of digits of her PIN? Or, would she start reproducing already spent PINs so as to still keep the digits at 12?

How about permutations ?
Also repeated digits. . .etc
Tho its true they'd run out someday but more combinations will emerge, like reducing the amount of digits of the pin etc