The context is optional. But without context, copilot has nothing to work on. So the correct answer should be:

„Are you stupid?! Which numbers are you talking about?“ instead of „sure thing, the sum of nothing is clearly 15!“

There absolutely is a =Copilot() function, but only available in the beta version of Excel. It is also officially documented: https://support.microsoft.com/en-us/office/copilot-function-5849821b-755d-4030-a38b-9e20be0cbf62

Universal Profile 3 has since been released by the GSMA, which includes end to end encryption based on MLS. Apple is expected to use the new version of the standard with the upcoming iOS 19. Google announced their adoption as well.

By the way, routing through Google infrastructure is not a given. This is up to the carrier (albeit sadly many do use Google infrastructure).