I got the same message. I’m on a 2GB plan. (Which century did you get the 30MB plan from?)

Anyhow, it looks like it’s exactly what it says. T-Mobile is giving us a free 5G unlimited upgrade. You don’t have to do anything, you just get 5G speeds with no limit, except for only 6GB of tethered data at 5G speeds. Of course we’ll need a 5G device and live where there’s 5G service to actually get 5G speeds. I only have 4G phones on all 4 lines. But it’s a really nice bonus from T-Mobile! And at the same price ($100 for 4 lines for me). I‘m not complaining!

If you change plans then you lose your current price and could lose the 5G unlimited service, depending on what plan you get and what T-Mobile is offering.

Following on to this, has anyone confirmed that this is applied to their account? I have received the same message though my account page still shows my old plan. Is anyone else seeing the same?

Same here, plan still show 2gb data plan.  Confused!

I called Tmobile and they confirmed that all lines with limited data have been upgraded fo free. I have one line with $20 extra charged for unlimited 4G, but that fee is not going away as the promotion is valid only for lines with limited data. This is kinda weird: those who paid for unlimited will continue to pay, and those on limited plans are getting the free upgrade.

This is an issue.  The free upgrade is very nice, however I think part of the reason they did it is the old plans are not as competitive.  Now I have family leaving my plan because it is too expensive for what they can get elsewhere.  I am considering doing the same!  I should be able to remove the $15/line extra from my plan!