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YMMV – received a targeted email. Seems like another Tmobile free line deal. Got this in the email. Likely $ 10 for the SIM (unless you can get it waived).

T&C

Via monthly bill credits. Limited time offer; subject to change. Free new line for accounts with 2 to 11 voice lines; plus taxes & fees for accounts currently paying for a T‑Mobile wireless line with additional taxes & fees. Qualifying credit and Magenta, Essentials, ONE, or Simple Choice plan required. Credits may take up to 2 bill cycles; credits will stop if you cancel any lines. Limit 1 offer per account.