What year did TMobile make the gold contact on the sim card smaller?


I noticed with the newer T Mobile sim cards that the gold contact is much smaller than they use to be and so I was wondering what year did they make the gold contact smaller?

The reason that I ask is that I have a sim card that has the larger gold contact and I want to get a used older phone for emergencies and was wondering what year did T Mobile resize the gold contact on the sim card so that I know which used older phones would work and not work? 

I do know that they work in 2015 and older but don’t know when T Mobile resized the gold contact after that year.

I would like to get the Go Flip 3 but don’t know if the gold contact was already resized smaller by 2019 and so no matter how much trimming around the gold contact that it wont fit? 

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