A hot line is a dedicated phone number designed help people. So when you call that number, you call "the" hot line, not "a hot line", and never "into a hot line"..
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dimsumexpressand never "into a hot line"How about the idiom "to call in"?
SheltieBitesIs the second one just as correct as the first?No. You need to show that the phrasal verb is "call in", so separate "into" like this: "in to".
AvangiHow about the idiom "to call in"?She called in to a talk show.She called in to a hot line.
AvangiWhat's wrong with, "When I call that number you gave me, I get a hot line!" ?Nothing!