I don't think it will matter if you're in a "Spark Market" as far as picking up more than band 25. Perhaps the more tech savvy people can comment, but if the 4G signal on the other bands is there, a tri-band phone should pick it up (after the phone updates come). For example where I'm at in Cleveland, wimax market, I assume the phone will pick up the 2500 signal even though its not a "Spark Market"