Not quite
Isn't this what happened with the transition from 3G to 3gS? Was there a price increase because of 'network speeds of up to 7.5mbps' or something like that?? Umm... I'm still seeing the same speed btw...
Your thinking of the upgrade from 2G to 3G
Unlimited Data went from $20 for 2G to $30 for 3G
I'm convinced that while you can grandfather your 3G data plan for now with your 3G phone or even when you upgrade to a new 3G Phone
When you want to upgrade to a 4G phone you won't be able to keep the 3G plan as it is a legitimately different service and will be priced differently.
Verizon has said as much about 4G and it's obvious AT&T agrees on pricing.
So in short being that I use about 250-300mb of data a month on 3G and I know I'll be getting a new phone in 2011, after LTE comes out and when I am sure my unlimited data will go away, their is no point is trying to hold on to my unlimited data for a time when I use more because the tech is so much better.
I'll just take my $5 savings and be happy for now, though AT&T's pricing structure on texts and now 3G really peaves me, it's always the same a tiny plan that almost no one fits into and a larger plan that is way more than what most people need.
200 texts = $5
200 mb = $15
1500 texts $15
2GB = $25
The average high for a iPhone user is about $500 mb but they don't over a 500-1GB plan of course not
my average as well as a lot of people I know average 500 texts a month but then again no plan for that.
It was the one thing that made me really mad after switching from verizon where I paid $10 for 500 texts because they have fair in between options unlike AT&T