It is extremely hard to anonymize metadata, thats part of what makes its capture and analysis so insidious.

Please tell me how i anonymize the metadata of where my cellphone is located, which the telco harvests from towers its connected to.

Put it in a bag, and don’t use it.

Cellphones are a pain, that's true. I was mainly thinking about Internet metadata.

If you really care, one option is having multiple phones, under different identities. Each one only gets used in a distinct set of locations, for distinct projects, with distinct recipients. When not in use, you store phones in labeled Faraday bags. That is, compartmentalization.

Another option is to nuke the radio in your phone, use only WiFi and VPNs for internet access, and use hosted cellphones from multiple providers. You can still compartmentalize, but need only carry one phone. But you depend on WiFi access.