Quote:
Originally Posted by Stu
I don't know why they shut down the numbers that quickly. I have a friend who runs a small local VOIP service catering to small businesses. Level Three gives him Michigan DIDs for free. At the wholesale level, they is effectively no charge for these numbers.
My guess is that the numbers are tied to the carrier and they get a cheaper rate doing it this way.
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IMSI are linked to CTNs (cellular telephone number). CTNs can be replaced by another one, but never be replaced once the IMSI is deemed canceled. Once you cancel your line, the IMSI is know as retired and can't be reused.
The only thing it could be, is they park your number, the IMSI is still attached to a CTN, but they put a block on it, so the minutes can be use among the other users in a pool. They can then charge you to reactivate. Probably you keep your CTN in this case. If they indeed change them, I don't see rhyme or reason why so.