In a selected port, with a crane. That’s basically the tl;dr from the video Kalash posted at 4:23 time index.
But the Houthis didn’t fire at warships. I know some outlets had similar sounding titles but they were clickbait and their own articles were contradicting their title. The Houthis were firing towards merchant vessels and within 20 km or so, there was also a warship, which then reacted.
As you didn’t read the article:
They hand out SIM cards to track those SIM cards. Using a certain messaging app on the phone or not doesn’t change SIM card tracking within the network.