Go to
http://corolada.com/prl/ to download the correct prl. The most recent prl for your phone is 3031. Some will say to download prl 4036 to allow roaming on Sprint's Evdo data network. I personally had connectivity issues with this prl, so I use 3031. Here's the download link:
http://corolada.com/prl/alltel/30031.prl
On a side note, is your phone an Alltel phone? Shouldn't matter, but like I said, I thought part of my problems with my Apache was that I was using a Verizon phone on the Alltel network, and even though I flashed the phone with an Alltel rom, it somehow still retained some verizon settings, and tended to revert to them when I dialed *228. It screwed my data settings up like crazy. Had to go into the EPST settings to edit the security settings from @vzw.com to @alltel.net, and the passwords from verizon to alltel.