So you jest got cid servese. You whant a box with 99 number memory but you didnt whant to spend 79.99 on a silly cid box. So you bought the box from Bell atlantic for $5. Well if you got one made by cidco your in luck (turn it over to find out). they use the same bord in all of the models. but you may be asking what determens the number of calls well if you, un screw the back (make shoue to remove batt and disconnect the moduler jack. duh.). look for servel soder points marked, a,b,c,d. if you have 25 you would have c soderd. but if you remove any of those sodering points it gose to 99. so get out you weller staion and heat the soider point for a cupple of secs. then put back to geter and when you start the box up it will tell you 99.