I wish I could recommend what I use, but unfortunately the company went out of business!
It's an app called TriggerTrap, you load it on your phone and get the requisite cable that plugs into the headphone jack. They made one for the Nikon 10-pin, as well as Canon/Sony/etc. cables. I saved an older smartphone (my S22 Ultra doesn't have a headphone jack). I found the cable on that big online auction site.
It has more than just a simple release, as shown in the screenshots. It's what I use for astrophotography, the last screenshot shows the 4 minutes I have set, but that the app can run for hours.
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