[WarOnPrivacy]

> Is there a client-side way to tell if an SMS is sent via TCR?

The TCR is a list that wireless carriers use to decide if they'll let a SMS message proceed or not.

I doubt the message itself indicates that it was weighed against the TCR list (it would require modifying the message).

[tcrhelpforsms]

Yeah, this isn't like e-mail headers where different hops in routing will insert additional information.