i am no expert at cellular networks and data, however this whole "it's my data, i should be able to do whatever I want with it" is a bit bs.
LTE allows for more bandwidth and strictly is for data. 3G on the other hand handles both data and voice protocols.
For those FaceTiming on 3G, you add significant strain on the AT&T network. People forget that when 3G first rolled out (around 2005), the amount of traffic was next to none. Yes infrastructure has improved and evolved, but at the end of the day, it is about delivering and meeting the Quality of Service expectations. You must also look at the amount of smartphone traffic that the 3G networks now see...it is at levels probably not thinkable back when the networks were first rolled out.
So yes, moving FaceTime only to LTE is smart.
ATT LTE does both Voice and data as well and both at the same time just like HSDPA(+) does. Verizon, Sprint LTE only does data or voice but not both at the same time....... now thats a bummer.
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