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Mine changed in October. But yeah, shortly after notifications went to hell.
* Noticed this morning that they are also available under my online account.

I don't miss them. I maintain a balance and monitor via the shortcode, and online as a last resort.

Correction: since 11/7
* But just now:
You've used 48.0129GB of T-Mobile data overall this month. If you exceed 50GB before your cycle resets on 02/08/2022, you may at times notice reduced speeds...

I've received nothing from 456 since 11/5. No payment reminder, confirmation, or approaching, reaching data cap. OTOH, when I do reach my 5GB cap, I don't seem to be throttled. Today should be the...

Yeah, it changed after the new and improved billing mgmt system change; you'll have to dial #BAL#.
Dial #WEB# to get your data usage - but it's now only a paltry report compared to previously.