T-Mobile on Saturday became the latest major American company (it's the country's third-largest wireless carrier) when Bloomberg published details from a memo sent to the company's staff.

The policy will apply to all employees who require "regular or occasional" access to T-Mobile's offices, which the company says means practically all of its staff. Those who don't comply will have their badge privileges revoked, and will automatically lose access to all T-Mobile facilities.

"Affected employees who do not become fully vaccinated and obtain a Magenta Pass by April 2 will be separated from T-Mobile," said Deeanne King, T-Mobile's chief human resources officer, in the memo, referring to the internal digital pass that requires the proof of vaccination.

"T-Mobile's badge-controlled offices continue to be accessible only to those who are vaccinated against Covid-19 and we have shared with employees that we are requiring office workers to be fully vaccinated by April 2," it said, with limited exceptions for certain roles, locations and legally mandated accommodations and exemptions.