all transmission from handset to cell towers is binary in/on a RF carrier. So does the VoIP which does not have a FCC mandate for minimal voice quality, use less or more than the 'traditional voice' digital stream? If the VoIP uses less, then it would be to AT&T's benefit to support it. Those who are much technically inclined and can lay off the pseudo-technobabble (in plain english please) now is your moment to shine & do some 'splaining.
Good question. I'll give it a shot, or at least lay out some info and thoughts.
- Skype will test your speed and use 3-16Kbps.
- GSM's voice codec can use 7-12Kbps.
Everything depends on what rate your voice is being encoded at. And don't forget it's probably a duplex connection, so you can both talk at once, thus double the bit rates. But that's not important.
Let's say they're both encoding at 12Kbps. Now it gets fuzzy, for two reasons:
1) For the same encoded data, Skype will ALWAYS use more on top of that, because it's using a IP wrapper, whether TCP/IP or UDP/IP.
2) Phone companies still use a circuit switched paradigm for consistent quality. GSM voice uses time slots dedicated to you and you alone.
So the question really is, which one uses more carrier resources?
GSM voice uses a fixed amount of time, which prevents anyone else from using that time slot. So that's one measure of resource usage.
VoIP uses GSM data slots, which could be more because of overhead, or perhaps less when nothing is being said (silent time).
Edit: two more thoughts. VoIP users with unlimited data plans, might tend to stay online far longer and tie up resources. OTOH, VoIP will shunt to the Internet ASAP, while GSM voice will use up carrier internal lines all around the world.
I think it's basically a wash, with the caveat that VoIP has less priority than GSM voice. Anyone else have thoughts?
Background apps do have certain advantages, but in this case, Apple's solution really is superior to what other phones make you deal with. (Manual memory management and apps bogging each other down? The Pre reviews sure don't make me jealous of that.)
You guys who moan about manual memory and apps.... have you never run more than one app on your laptop at a time? Have you ever had to stop one to make the others run faster or give them more memory? Of course. Annoying yes, but was it really rocket science?
And the Pre has the perfect paradigm. Just flip the app's card away to stop it. Too easy.