number mix up

Manuel emailed me.

Forgot to mention.  When I called you on your cell earlier, I got a voice mail from [the house].  I checked my phone and confirmed I dialed correctly.  Just to let you know.

I was confused. I don't forward. He had reached me on other occasions at the mobile number. I think he either dialed the land-line by accident or has the land-line number in the cell phone field.