Isn't UMA a function of the phone (and the features that the carrier gets RIM to install on it) rather than the network? For example, I've used my 8900 on UMA in South Korea, with the mobile network off since there's no GSM service there at all. What has TMO and its network got to do with that capability - or does the fact that it's a TMO SIM card determine UMA even outside a TMO area? Just curious.
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