Curve gift pack - what is this?

I’ve recently received my investor gift pack which was a pleasant surprise, however what is the small ‘badge-like’ device for? It looks like it might hold a SIM card but there’s no angled corner so I’m wondering if it’s to hold a data card or something similar?
Any ideas? Is curve issuing just the chip now to put in this badge so we don’t have to use the card? Or is it just a badge?

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