07-04-2012 07:08 AM
Welcome to the community, as you said it worked all day then I think there must be some problem with carrier, You can check that it connected to BIS or not ,on your Homescreen Go to > Manage Connection >
Service Status >there you can see that it is connected to BIS or BES or not ,if not contact your Service Provider.
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If Problem Resolves mark the post(s) as " Solution ", so that other can make use of it.