Upper case means you have full network coverage. Lower case means you probably can only make calls and sms, email and web browsing may not. Below taken from another forum:
"The "ev" portion of it has to do with whether or not you're on EVDO speeds. The difference between "EV" and "ev" is whether or not the Blackberry is connected to the Blackberry Data network. No connection to the data network means that you won't get email or browsing on the BB. So, if you're 1xev, you're on the network and at EVDO speeds, but the BB cannot connect to the carrier's Blackberry data provisioning network, so anything that requires a data connection won't work."
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