Yep happened to me. I did multiple full system restores and eventually LTE came back, but toggling it off will put it into 3G and it won't toggle back, so I can't turn off LTE until the next beta.
I even reset my phone's network settings and nothing.
Appreciate you're input.
Maybe it just isn't falsely labeling 3G as 4G in this release.
So I nuked the phoned last night DFU style and installed a fresh copy of beta 2 and now I have my LTE back along with suprisigly less glitchyness in the OS. Good stuff. I recommend this for everyone with this problem.
A good thing to do w/ Bata is setup as NEW and/or do a hard reboot ( home + power) this usually fixes most problems..
In this case just turn airplane mode ON for a min then off. It'll "Searching.." Then you be back on LTE
Did you restore from a backup onto the clean install? Or just set up as new phone?
I tried a clean install last night after having no LTE on an OTA install of b2. My observations were:
OTA b1 to b2 HAD LTE at first but lost it over night. wouldn't come back.
Clean install of beta 2 via iTunes and phone in recovery mode, set up as new HAD LTE. Seemed ok.
Restored from ios7 backup via iTunes and LOST LTE.
This leads me to think the issue is with something being carried over from ios7 update.
My next step is to reset all settings in ios7 then update to beta 2, see if that gives me LTE. I'll try this at the weekend tho.
Checked EE (UK) carrier version at each stage and was 16.0.2 on beta 1 then 16.0.4 for beta 2. 16.0 now on 7.1.1
In the iOS 6 beta, AT&T paid Apple to display "4G" instead of "3G" on the status bar of your phone. 3G is HSPA, and while I believe that HSPA+ should still be called 3G, AT&T used it to say it had the only "4G" smartphone. (This was of coarse before the iPhone 5 and LTE capabilities)
What I believe happened in the iOS 8 beta, is that AT&T must have had a contract with Apple about the "4G" name, and it recently expired. Hence the "3G" showing, as it should.
Sorry if this doesn't answer your exact question, but I found myself on this thread wondering if other people had the same thing happening to them, and thought that I may as well post so if others like me find this thread they will see my answer.