[Asphyx]

Basically Verizon caught onto what everyone was doing....

Can't say this will work and you might lose your sprint phone by trying it so keep that in mind....

Try flashing a stock Verizon rom and relock...
Take it to a Verizon store and tell them your phone stopped making calls...
They might find a way to activate it right there but there is also a very distinct possibility that they will give you a new VERIZONIZED version of the TP...