Can I get a second SIM card for an extra old iPhone 8+ that I use for web access for kids while traveling?

I  have my iPhone 8Plus 256 G  that is my main phone.  My son gave me his iPhone XsMax 512G to use for photography. But apparently I need a SIM to enable "Location" on the photos and to be able to track it on  Find My" app.  Can I get a SIM card for the XsMax without having to pay for a new phone number?

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