Geo IP for Verizon Wireless and T-Mobile are close to worthless; they effectively allocate from a nationwide pool. If not more, hundreds of thousands of users

Geo IP for Verizon Wireless and T-Mobile are close to worthless; they effectively allocate from a nationwide pool. If not more, hundreds of thousands of users share a single IP on T-Mobile, if you are talking about IPv4. They stopped handing out IPv4 a while ago. It's all v6 + CGNAT. If it's web traffic and not arbitrary TCP TLS traffic, likely even more users share it as they cache web and run it through shared proxies.