Since setting my Nokia 3G handset on 3 to only use 3G coverage & not GSM I’ve had much better service. The handset used to spend its time switching between 3G & GSM when coverage was flaky. This seemed to be far from seamless. The result was that I regularly used to lose signal where the coverage was a bit flaky. 3 has disabled the ability to set the handset to GSM only (because they pay roaming fees to Orange, their GSM partner) but 3G only works fine for me.