I think one of their carriers is AT&T... I know they have verizon and sprint (i had them both). Like I stated, I have zero bars at my house but with the antenna and repeater I'm solid. The upload is around .5 for me. Give em a call or email them. They would be able to tell you which would be best for you. A ton of info is on that dslreport site I posted too.
You should start your search here.
http://www.eqemulator.org/forums/showthread.php?t=32980