We're checking with Cablevision, but at first glance there doesn't seem to be a way to join the two numbers. Perhaps Google Voice would work as a unifier, but we can't say for sure before testing it out.
Nevertheless, if you're already a Cablevision subscriber looking to save some money on your cell bill, Freewheel could work — especially backed up by a SIM. Non-Cablevision customers, however, should really look elsewhere to find better deals at or around the same price that include wireless network access.
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