You might want to run through the FAQ at Howardforums for ST. AFAIK, Verizon coverage via ST won't let you use a non-ST phone or smartphone (e.g. Verizon branded iPhone 4S). I may be incorrect regarding such a phone that was jailbroken, but it would be worth asking @ Hofo yourself if that's the phone you wanted.
Look especially close at the FAQ regarding difference in coverage based on the type of phone you ended up with, especially if it's ST supplied.
Has anyone used the Straight Talk prepaid service form WalMart using iPhone or Android? Att vs. Verizon?
I'm currently a verizon user and want to keep my #, but i don't think that's an issue these days. Thanks for any feedbackk.