Multiple WiFi Connections as Multi Wans Questions

[KyferEz]

First, I'm going to be out in the boonies where cable, dsl, etc. is Not available. But 3G is and I have 3G on my phone and tablet with software that makes them WiFi access points (FoxFi).

I want to setup a pfsense box to connect to both those access points simultaneously (for fault tolerance and better speeds) and because the 3g looses connectivity on my phone when I get a call.

I also want the PFsense box to be my wifi AP.

So I would be looking at having 3 USB WiFi adapters connected. I've found some high power cheap ones that it appears is compatible with pfsense 2.0. They are the Ralink RT3070 on ebay.

My questions are:
1)Does anyone have good or bad experience with these adapters?
2)Is there any problem connecting pfsense to a phone's wifi AP?
3)Are there any known issues when using several identical usb wifi adapters in one pfsense box?
4)If I turn off the WiFi connection on my phone, and a few hours later turn it back on, will pfsense automatically reconnect to it?
5)Anything else I should be aware of in view of the selected hardware or pfsense configuration?

I appreciate your help; I really would like to plan this out before I spend any money on the adapters ;)

Thanks!