Apple Watch series 2 A1757
Can I use a SIM card in this watch?
iPhone 13, iOS 15
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No, you can not. Only the Series 3 and newer support GPS+Cellular capabilities, also just so you know you can't put a SIM Card in any Apple Watch you need to download an E-SIM onto a compatible Apple Watch from an iPhone.
The following articles might explain it better:
Set up cellular on Apple Watch - Apple Support (CA)
Identify your Apple Watch - Apple Support
Apple Watch - Carriers - Apple (CA)
I hope I anwsered your question!