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One of their optional questions is "Who is your "one phone call" and why?"
What does this mean?

Traditionally, you get one phone call when get arrested, and you call your lawyer or your parent or a bond agent to come pay your bail and get you out of lockup.

I assume GULC doesn't literally want to know who you'd call to bail you out of jail, but probably more of a metaphorical "who's the one person you can always depend on/you trust the most/you think of first to call when you're in trouble?" That sort of thing. At least that's how I interpret it.