No Service after ugrading ROM HTC Touch

[Old Faithful]

Hey Folks,

I was having trouble with connections in the past few days and decided to reflash my phone.

So I did, and now I have No Service! I read elsewhere that I may need an A-Key, however when I look at it using EPST (##778#), there is none. Also, I noticed that my activation date (dec 27, 200 disappeared as well, as did my slot cycle index setting, which reverted to 2 from my setting of 0.

Does flashing mess up the EPST settings? I've tried reflashing twice, to no avail... NO SERVICE!!!

Any ideas what i could do myself? I need this phone for work!!!

TIA for your help!