Just a quick one,

Have any of you iPhone 4 owners noticed a lag in the time it takes for your iPhone to switch to 3G from GPRS/standard cellular data?

I've noticed that mine takes a while before it realises the 3G switch is on, and the speed test results I get are very random at times - going from 0kbps down to 1Mb up?!

Just wondering if anyone else has had any similar issues?