No, i didn't port.
i've been with Sprint since february, and the seller of the Evo was with Sprint as well.
it's been nearly 1.5 hrs since i factory reset (not having installed ANY apps) and it is working...(fingers crossed)
i'm thinking it might actually be NortonMobileSecurity.
but that's just my own thought--fairly unfounded except for it's security permissions when installing.
Do not use a task killer or virus "protector" on your phone that will definately delay texts if you get them at all. Also, you can send "Allow All" to 7777 to make sure that all of your texts are being allowed to come through.