HPSA+ vs. iPhone 4S in San Francisco

[netarc]

fwiw, I found that the West Portal neighborhood of SF has some stellar speeds...

The odd thing is that I live just 1.5 miles up the hill from here, and in my neighborhood the max I've ever gottn is ~2Mbps down ... that's a heck of a lot of variance for <2 miles distance?!?

 

[netarc]

Didn't get any responses in the thread I started, but does anyone here know the answer to this?

I understand that ATT's 3G network in the SF Bay Area is now HSPA+, but from what I've read apparently the effect on phone speed is negligible unless the "enhanced backhaul" feature is also enabled. Does anyone know whether this has been done yet for the SF area, and if not has ATT released a roadmap of when this work will be performed?

Specifically, I'm wondering whether the 2-5Mbps range of download speeds I'm seeing on my S2 (wildly varies depending upon where in the city one is) are the max this phone will ever see, or whether it's conceivably the phone my be able to achieve 10Mbps+ once the network supports it?