There's a war going on here in the US. It started with the iPhone overloading AT&T's 3G network.
To capitalize, Verizon Wireless (VZW) started it's 'We've got a MAP for that' campaign, saying their 3G coverage map is 5 times larger than AT&T.
Today AT&T is unloading with both barrels back at VZW. They launched a'Truth About 3G' site, and have started aggresively running ads.
The key message:
With VZW, you can't talk and surf the web at the same time.
The message might sound familiar: it's the same problem with CS Fallback.
With VZW's network, the 3G service is "EV-DO", which partially stands for "data-Only". Verizon's 3G network is data only. If you want to make a call, you need to 'fall back' to the CDMA network.
With CS Fallback, the LTE network is 'data only'. If you want to make a call, you need to 'fall back' to the GSM network.
Check it out, bashing CS Fallback is the theme of AT&T's current nationwide advertising campaign:
I'm not sure too many operators are ever going to deploy CS Fallback.