When you buy airtime, it expires 90 days after purchase. I do not think there is an actual expiry on an unactivated sim. If so, I am sure speak out would be more than happy to activate it. It would be retarded business policy if they did not.
I would have once argued the longer you wait, the better the phones get. Then they decided to sell locked crap like the Nokia 1661. I think all their new stock is now locked