[PhillyG]

From the second wikipedia link:

Solutions Create an account Blocks on T-Mobile IPv6 servers are set to "anon. only" (sometimes abbreviated as "AO" or "AB") meaning only registered users who have logged in can edit from this IP address. If you are currently blocked from creating an account, we suggest the following:

Create an account on a desktop or laptop computer and then log in with your phone. Ask a trusted friend on a different network to create an account for you. You may use Wikipedia:Request an account. Try again after the block on your IP address expires. Go to my contributions and follow the Block log link at the top of the page to find the length of the block. See Why create an account? for a full list of benefits that come with registration.

Bypass T-Mobile's IPv6 servers The easiest solution to avoid being blocked from editing Wikipedia while using T-Mobile is to bypass their servers altogether. By connecting to the Wikipedia servers from your desktop or laptop computer (or from your WiFi), the IP address that Wikipedia's server will see is one that is owned by your desktop ISP, rather than that of T-Mobile.

Instead of editing Wikipedia using the T-Mobile cellular connection, try using your WiFi connection. (This is increasingly a false dichotomy. T-Mobile is pushing into the home internet market with 5G cellular—to the tune of more than 640k US households at the close of 2021.) Use a desktop or laptop, or WiFi only tablet computer. These computers are most likely not using T-Mobile, and therefore, do not route traffic through T-Mobile servers. Autoblocked If you have already logged into an account and your block message reads "Autoblocked because your IP address has been recently used by" followed by a username, or your block log (check via the Block log link at the top of your "my contributions" page) does not list any current blocks, then you have been autoblocked. Please go back to your blocked page and follow the instructions under the Autoblocked? section or alternatively here.