I don't see their offering as competitive at all.
edit: just saw the "plus taxes and fees" of which there is none for me. So, I pay even less now.
PS - The difference is that with the value plan, phones are no longer "free." You have to have a separate credit line (called: "AT&T Next"). So a phone might be $30/month for 30 months.
All I am saying is, AT&T's offer no longer does, so it is close to what Google/T-Mobile are doing.
Depending on your plan they might be doing the same for you now too?
I think AT&T only rolls over data to the next month, so you aren't actually accruing anything. Unlike T-Mobile, who I believe roll over data for up to 12 months.
Month 1: Get 10 Use 5 = 5 rolled over.
Month 2: Get 10 Rollover 5 Use 5 (of the 10) Lose 5 (already rolled over) = 5 rolled over.
Month 3: Get 10 Rollover 5 Use 5 (of the 10) Lose 5 (already rolled over) = 5 rolled over.
Month 4: Get 10 Rollover 5 Use 5 (of the 10) Lose 5 (already rolled over) = 5 rolled over.
By Month 5, you would think you would have 30 (10 + 5 rolled over from each month) but you only get 15.
I could see coverage being an issue if you're in the country but that's not going to be an issue for too much longer.
Anecdotal i gues, but if you look around its quite easy to find new flagship phones for very cheap, especially right around when the new iphones come out and people are clamoring to trade up
Moto G is my personal preference though I bump into the limitations of that a lot.