I'm on my fourth blackberry bold
on orange UK
First one... kept losing connection, dropping calls, even when stationary.
Second one (refurbished)... kept losing connection, dropping calls, even when stationary.
Third one... (refurbished, provided after orange had started selling them again - they'd stopped selling them because apparently they were having dropped calls, losing connection etc)... kept losing connection, dropping calls, even when stationary.
Fourth one... NEW provided by Orange... still working after almost 25 minutes, though I haven't made any calls on it yet