Frankly not being on Verizon in Oklahoma is a good thing. I have ALWAYS had better call clarity and signal on extended network in Oklahoma (Sprint and US Cellular) Missouri (Sprint) and Kansas (Sprint and Alltel) than I have ever received on the Verizon home network, including at home in California or traveling (Michigan, Pennsylvania, et cetera).
Given Verizon's ability to keep a connection, the only good thing I can say is that they have a better network than Cingular in California. Which doesn't really mean much.
Ohh, yeah, the *228 thing? Since Verizon doesn't really have roaming, it doesn't really do anything in Oklahoma.