Internet first, voice second
I have notice a huge flaw with my phone. Supposedly, the best thing about 3G is that you can be on the internet and have a phone call at the same time. Unlike 2.5G GPRS which is like a V.92 dial-up in terms of low bandwidth and (lack of) connection permenancy - you can't receive calls when you're actively on the internet.
On my SEM K800i I find that even with 3G good reception, I get awful call quality, because it can't handle a switch-circuit voice call and data at the same time. It keeps dropping a lot of downstream switched-circuit voice data - and I can't hear a damn thing. This means I have had to stop using push email (which maintains a permenant internet connection to the email server). I have no idea whether this limitation is due to the phone itself or UMTS technology. Has anyone else experienced this problem?