What are /r/wmmt's favorite Products & Services?

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Can confirm MT3 certainly had this feature, video quality's a bit bad but you'll probably see it: https://youtube.com/watch?v=8CLHqFIb0WA

Around 0:40 at the second hard S-turn

I don't think you can without reinstalling the app.

Your best hope would be getting an app like Parallel Space and using that to copy the app so you have an app for each card. That is of course if you want to use the app for multiple cards instead of just using a new card outright.