In "could you tell him to call me when he gets in", can you use "get back" instead of "get in"?

Thanks in advance.
"gets in" is, of course, "arrives". "gets back" is "returns".
So if he has been at the same place previously, "gets back" can be used as logically as "gets in".

If he is arriving -- by plane for the first time at a city where you live, let's say -- then he's not returning, and "call me when he gets in" is the only one of the two that makes sense.

Thanks Jim. You have been a great help!