Re: Trading security for convenience
Do not use a mobile to pay for drive through meals, or bridge or other tolls in the UK as use of a hand held, including a wrist device while driving is illegal.
So choices are:
1) Pull out card from wallet and pay in ten seconds or less.
2) Fumble about with an inside pocket, dig phone out of pocket (after 5 hand operations not so easy). Fumble about in front of growing queue to try to unlock the $%^&*()" phone, give up and either use cash or a card anyway.
Perhaps that is one reason I do not put any financial stuff on the phone (there are other reasons).