If the OP is on 3G or WiFi at the time, the device is capable of voice and data simultaneously. And indeed OP says other data apps send and receive data while phone is in use.
Perhaps blackberry twitter is intended to not refresh while the phone is in use, but I sorta doubt it. Maybe the "failure" to refresh is being noticed while on EDGE? Or maybe try a hard reset and then test.
Posted via BlackBerryForums.com Mobile
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