eng Ansari Education and Research Society Journal of Ultra Scientist of Physical Sciences December 2008 20 3 567 574 jusps-B 1381 article Akpan, Stephen S 1 Williams, Edem E., 1 Ugbe, Thomas A 1 Ukem Ey O O 2 Okoro, Rufus C. 3 Department of Maths/Statics/Computer Science, University of Calabar, Calabar (NIGERIA) Physics Department University of Clabar, Calabar (NIGERIA) Computer Centre, University of Calabar , Calabar (NIGERIA) <p style="text-align: justify;">The Pin Code printed on the GSM recharge card is a mean of recharging or updating users account. This code can be of variable length made up of digits. There are many methods of arrangement of these numbers depending on the network employed; each GSM operator has a unique relationship established among successive pin codes in relation to their serial number. In this paper it is established that the Pseudo Random number generator can be used to generate a GSM Pin Code such as the fourteen digit GLO Pin Code without repetition, beginning with the smallest two digit 10 and incremented by 1 after each group of numbers till the highest digit 99 is obtained, provided an initial control variable is established for the network.</p> https://ultraphysicalsciences.org/paper/1381/ Random Numbers Pin Code Generator Pseudo Repetition Prediction.