I would think it is theoretically possible but I've never seen a site to Unlock a Sprint or Verizon CDMA phones. Try using google and search for Unlock Sprint Cell Phone or something like it.
It's possible, but not all of Verizon Wireless's network operate in the 1.9 ghz frequency. That was what I was told when I was getting a comparison of Sprint (my original choice) and Verizon Wireless (my current provider) So the best bet is to get a CDMA phone that uses 800/1900 mhz frequency range. I don't actually know when my phone operates in the 1.9ghz range. I only know when it goes from digital to analog.
Having Wi-Fi troubles?
From the garage to the basement, we blanketed every square inch of the CNET Smart Home with fast, reliable Wi-Fi.