Originally Posted by adkalra
My question is more on the hardware side. If Vodafone has roaming agreements in Central/South America the phone would have to have the hardware to be able to roam on those GSM networks i.e. GSM 850/1900. The phone would have to be a Quad band GSM to roam on all of those networks.
Not necessarily. It could roam on Verizon's network. Vodafone and Verizon do have roaming relationships, for other GSM-CDMA hybrids.
It's probable that the Thunder is CDMA North America + dual band 900/1800 GSM (plus 1900/2100 3G, if that's what Vodafone uses). As a result, it'd become more pratical for Vodafone units to roam on Verizon.