How to get the Last Call in Fortnite

Here's how to get the Last Call in Fortnite, and where you can find Stalkboxes around the map.
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Where to pick up the phone at a Stalkbox in Fortnite - Ghostface Challenge

Fortnitemares has arrived in Fortnite, and one of the challenges is to find a Stalkbox. These are a fun new mechanic that ...