Here’s the specific instructions from a Facebook group that worked for me.
Sometimes it’s easy, sometimes it’s difficult. It can be a tedious process because they do a credit check so you need SSN and driving license numbers ready. I had to do it twice because after the order is created you receive an email with a link to order status which has a link to a form to accept the terms and conditions “before we can complete the order”. That form didn’t work for me. It returned a big red TC009 error. Calling support just ended up going round in circles getting nowhere. That order was canceled overnight. I ordered again the next day and got the same problem with the T&C form but a few hours later it shipped. Some people have reported going through the process three times and hitting the T&C error every time and giving up in frustration.
The whole concept of needing to verbally exchange long numbers with someone on a line with poor audio quality, possibly in a different country with a potential “accent barrier” pretty much sums up AT&T. That said, the sales people I got both times were really good. They knew exactly what I wanted and it went quite smoothly. Other people report calling several times and being told that there is no such plan.
My intention was to use it in an iPad for tethering. It had unlimited hopspot / tethering but that has changed in the last few weeks, It now throttles to 128 kbps after 10 GB.
Lots of people are still successfully using it in a router with an APN of “broadband”. There are mixed reports and opinions on how safe that is from being shut down for being an unapproved device. I think AT&T is looking at this plan and wondering why the traffic is so high. They killed the unlimited hotspot but that’s probably not going to reduce the traffic as much as they think. Logically the next step would seem to be to go after those using it in a router. Of course the bulk of the traffic is probably all the routers that have had their IMEI changed to look like a tablet which seems to be pretty much standard procedure on some forums. When they finally figure that out, who knows, they might cancel the whole plan.
Sorry to sound a bit gloomy. I guess you might as well use it for as long as it lasts. The thing that stops me using it in my Pepwave is fear of getting the IMEI blacklisted which is much worse than simply having an account shut down. I don’t know if there has been first hand reports of it happening but I think it could.
I still have my 400 GB for $79 reseller plan. Unfortunately it’s no longer available at that price. If it falls apart and I consider doing something unapproved, I think I will go for a post paid phone plan like Unlimited Elite. Surely they’ll go after those abusing the system for $20 before those paying $85.