No, if they get a new number, you have to add it to the file (Filename e.g.: UsedNumbers.txt). There are all the numbers inside which are in use.
If you have any questions feel free to ask.
Jeffry
Yes, but if i get number 4444 and i will have a new number i get number 5555 i have to delete that from the file so other people can get number 4444 since its not in use anymore .