Hmm, I've just encountered the same issue with 4G not showing up although this occurred to me after my phone was temporarily disconnected from a late payment. I took it to it to the Metro PCS corporate store but they couldn't fix it :\ So now I have to wait 5 days to get a new one replaced! And I also have to pay $10 since it's over the 30 day return.
Kinda sad that I'm going to have to restore all the crap that I did to my current indulge. Root, bloatware removal, jingle removal, custom launcher, and wifi tether (Which I didn't get to test yet since the 4G hasn't been working since I was able to download it)