Learn what "when did you" means, when people say it, and how to use it naturally in English.

It is a direct question asking when a phone password was changed.
From I'M Obsessed With My Boss Part Ii, Episode 15
The speaker asks when someone changed their phone password, suggesting suspicion.
Use this when checking a security-related or privacy-related change. In a relationship argument, it can sound suspicious or intrusive.
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