Unlimited data plan overage: HSPA+ turned off, only LTE worked
Recently I received a text that I was at 75% of my 5GB "limit" (although I have an grandfathered unlimited data plan) and after I hit the "limit", the 4G HSPA+ on my phone would no longer work, and I had to turn on LTE. Normally I have LTE turned off because I find it drains my battery, but I could not get any data through on regular 4G HSPA+ without turning on LTE.
For a few days I thought there was something wrong with my phone, and I even tried switching SIM cards with a friend but nothing worked. Then I considered that AT&T had used this ploy to throttle my service (although I am not sure why turning off 4G HSPA+ is considered a throttle). And this is what they did, because when my bill reset, everything went back to normal and my 4G HSPA+ works, with the LTE turned off.
Has anyone else encountered this? When I contacted customer service, they told me that this was due to network congestion and I was being throttled during peak hours of network use. I explained that I tried several times to turn my phone back to "normal", even in the middle of the night when I couldn't sleep. So I don't think this is what they were trying to do, most likely it was another one of their tactics to get unlimited data users onto their tiered plans.
Just curious if anyone else has had this issue.