[bencurry]

Well i'm pretty sure you'd still have to tweak the phone with the sprint rom to match your epst settings. If you don't have those settings it may be an uphill climb to get the phone working. If you're thinking about running the Sprint ROM and configuring it to work there's going to be a lot of bloatware on there that won't work at all (Sprint TV and so on).

If you unlocked the phone, changed the MSL#, and flash the Alltel Stock ROM it would work well. That's how I did it the first time with my Diamond. But you will still have the Roaming Triangle.

From everything I understand the roaming triangle is from the Sprint Radio. If you want to get rid of it you may need to flash and Alltel Radio, which I haven't seen yet. From everything I understand there's a good possibility of bricking your phone when flashing a radio. The triangle is a little annoying at first, but I've learned to live with it.