Did he block me?

I'm beyond confused. The guy I'm dating went on a work trip last week and we haven't talked since he got there. We talk everyday and he texted me when he got there but then I went to text back and none of my iMessages will say delivered but they stay blue. It's been a week and still nothing. Also calling goes straight to voicemail with no rings but tonight I did *67 infront of the number and it rang for a while then to voicemail. What does this mean? We didn't fight or anything I'm confused if he blocked me or his phone is really off.
Did he block me?
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