Can I change the question?
"Is this something that is known at this particular location or across other locations?"
Besides the Blackberry mess, I find it's more a matter of location. My phone works better on the front porch than the patio out back. My neighbor has been doing the same when we don't want a drop during the call.
It appears to not be a device/carrier issue but a location issue.
<div class="inter-pagination collapsable"> </div>