[Moto X Q&A] lensgrabber:
Yes, back on LTE after a insane amount of time on the phone talking to people that act like they have a clue but in the end just messed things up even more. To answer your questions, because the dev edition isn't a "AT&T" phone, their system doesn't know what to do with your phone.

You can either give them a IMEI of a LTE compatible phone that is in their system (aka a AT&T branded phone) or they will try to switch you to some non-LTE plan (without your knowledge). If you have your older IMEI number then give that to them instead.

Here is what they did with me. Feel my pain. This was a couple of weeks ago. I went into a AT&T store and got a nano-sim card. They handed me one without problems. Mistake one. I should have just waited and had the store do the entire process but I had done the similar thing

with T-mobile the day before (regular sim to micro sim) and it was painless so I figured AT&T surely would go smoothly.

I got the Dev Edition on Monday. I called AT&T and gave rep my new IMEI and ICCD sim card serial. Everything was switched over and appeared to work. On Wed I got a e-mail and text saying the same thing in the OP. Okay that's odd cause I am on a LTE unlimited grandfathered.

I called and got a great rep (so I thought). She said that my plan was set to non-LTE unlimited and was changed on the 8th. I explained everything and she supposedly switched it back. Okay… I got off the phone and was heading home for lunch. I rebooted the phone so it could

re-register on the network. NO DATA! I called back when I got home (on lunch break) and was on the phone for the next hour and a half with the third rep. The lady I was speaking with earlier apparently deleted my data plan and did not save the changes when she said I was back

to my old LTE plan. At this point I am pissed. My grandfathered unlimited data was gone. He also couldn't add the grandfathered plan back in because it was a legacy plan. He would have to add me to a current plan and open a trouble ticket to get me back on what I was supposed to have.

He tried to add me back in but the IMEI that they had in the system for me wasn't allowing him to add me to a LTE plan. I dug around (thank goodness for Exchange) and found my old SGS3 IMEI and gave that to him. That worked, BUT, it required a voice plan change also. Okay.. two trouble tickets to open.

He put me on 550 rollover and 3gb data. I think the price increased from my regular $63 a month to $90 a month after those changes. Oh.. my 3700 rollover minutes vanished also. Okay, so I was back on data but was temporarily on plans that increased my bill by $30 a month. Not happy and at this point have zero faith in AT&T to fix their mistakes. He gave me $50 credit for my time. Probably within two hours I got a e-mail saying that the data plan was adjusted so I was back on unlimited web. It took me another week to get back to my regular 450 rollover plan and another

few days to get my existing rollover minutes back to what they were. It took four more calls to get this all sorted out. Well, so I thought. I should have over 3500 rollover minutes on my account. I have 28 days left in my cycle and right now it's showing 900 minutes left. SO… looks like I will be making yet another call to AT&T customer support to see what the hell happened to my rollover minutes. As you can see this has been more of a pain then it was worth. I should have just cut the sim card myself and never, never, gotten AT&T involved in the first place. This is incompetence at a very high level. It's almost as bad as my experience trying to get a $30 T-mobile plan working again.

---------- Post added at 09:07 AM ---------- Previous post was at 08:45 AM ----------

and after spending more time on the phone with AT&T, they deleted my previous rollover minutes (again) and had to add them back. I'm sure this will be a regular dance at the start of every cycle now. so unhappy.