Looking on the internet deeply has found these results:

on the other line is the most popular phrase on the web.

at the other line 19,000 results on the web	on the other line 13,260,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
their backs to the students at the other line. The teacher begins the first round by asking all of the students to make their signs They're amazed with the fact that there's a voice at the other line. It's just something so magical for them that they want to pick it up when it rings. Such is the ... Sep 19, 2010 ... Serbian. what words should you use to translate the phrase "at the other line", when talking about a telephone call? Syringa, Sep 19, 2010. each deer deciding what Sep 13, 2015 ... Then you look over at the other line you were just in and now that line is moving fast, and you realize you haven't moved in two minutes.	My girlfriend's on the other line. Tell him you're on the other line with another friend. Get me the Red Cross on the other line. I've got Billie Sue on the other line. I just that I had a major collector on the other line. Sorry, I got fiancée on the other line. She's on the other line, actually. Gestapo's on the other line.

at the other line

19,000 results on the web

on the other line

13,260,000 results on the web

More popular!

their backs to the students at the other line. The teacher begins the first round by asking all of the students to make their signs
They're amazed with the fact that there's a voice at the other line. It's just something so magical for them that they want to pick it up when it rings. Such is the ...
Sep 19, 2010 ... Serbian. what words should you use to translate the phrase "at the other line", when talking about a telephone call? Syringa, Sep 19, 2010.
each deer deciding what
Sep 13, 2015 ... Then you look over at the other line you were just in and now that line is moving fast, and you realize you haven't moved in two minutes.