Originally Posted by percysmith

Wirelessly posted (Mozilla/5.0 (iPhone; CPU iPhone OS 7_0_6 like Mac OS X) AppleWebKit/537.51.1 (KHTML, like Gecko) Version/7.0 Mobile/11B651 Safari/9537.53)

Billatq: nope. There's definitely no issuer-controlled option to opt out of DCC for visa and MC - otherwise you have all issuers setting no DCC by default which defeats visa and mc's reasons (anti-trust or profit) to set up DCC.

More likely the cashier opted DCC out for you, either due to something you said or input error. But did not do so for your friends.