What do you do when your boyfriend doesn't pick up the phone?

I called my boyfriend around 6 in the afternoon and he didn't pick up. It's been 4 hours almost 22:00 in the evening and he hasn't called back. It's unlike him. Should i text him?
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I did nothing it's already midnight. I will try to contact him tomorrow.
What do you do when your boyfriend doesn't pick up the phone?
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