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A man is out somewhere and ends up accidentally calling his own home phone number.
Aaah! I swear I just read this sometime in the past few months! Let me go back through the stuff I was reading.
The second is "Adjustment Team" by Philip K Dick (who might be the author of the first story as well). It's been done as an episode of The Twilight Zone ("Gabe's Story") and was the basis for the movie The Adjustment Bureau.
I remember a story similar to the first one, but the man phoned to his past self... It was called The Other End of the Line, by Walter Tevis. I don't know if that's the story you remember, but it's a nice short story and you should read it anyway. You can find it in an anthology called Far From Home.

A couple of short stories I read in anthologies, possibly even in the same one:
1) A man is out somewhere and ends up accidentally calling his own home phone number. To his surprise, he hears his own voice pick up on the other end. I have no idea where things go from here, but I think it gets established that there's apparently another him that takes his place in the house whenever he goes anywhere.
2) A story where the main character somehow finds himself in the recent past (possibly by missing daylight savings time, but I may be confusing things with an Eerie Indiana episode) encounters Clock Roaches of sorts in the form of stagehands who take apart reality like it's a set. I remember the stagehands seeing the main character and complaining about the "actors" wandering around where they don't belong.