Is there a big difference between making calls on 2g versus 3g? iPhone 4 specs says talk time is 7 hours on 2g and 14 hours on 3g. I'm usually on WiFi, would disabling 3g reception help battery life?
The voice quality is not very different in my opinion, but on 2g, people will get dropouts - a lotta times the volume will shift for them talking to you, or you won't hear them. Also, if you get a push notification or text, it can drop your call very easily - this happened with my iphone 3g until i turned 3G service on.
3G definitely uses a lot more battery, but it's much better than the headache of many dropped calls on 2g.
I'm pretty sure there is a big difference in voice quality from 2g to 3g.
If I am using 2g and someone sends me a MMS, will they get the MMS bounced back indicating it cannot go thru? Or will it be sent and make it seem like I received it when in fact I cannot via 2g?