What if I call a guy and he doesn't pick up?

This call would be the first call that I have made to him. Because we just met a few weeks ago and I "think" he is interested in me but he's playing hard-to-get! To cut the long story short, last time I saw him, he tells me to call him and then I'll find out if he's interested or not!

If he doesn't pick up, should I just leave him a voicemail, a txt, or just a missed call? Or what?
What if I call a guy and he doesn't pick up?
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