The title card reads "S1E06 Cellphone 101." Basket picks up in the stone room from last time, with the zombie pigman still standing there, and steps back through the portal to figure out the clock. "I think that the clock is a cell phone."
Reading the help pages
Typing help brings up "Aftermath - Zombie Apocalypse City Help," with pages for yelling, whispering, a walkie talkie, a cellphone and more. The cellphone page settles it: "/tell is disabled on this server, so you need to use a cellphone for personal messages across the map. Hold a clock item in your hand and write the name of the person you want to call." It ends with a warning: "Beware: People within 50 blocks can still hear you." Yelling works by adding exclamation points, which carries a message further and costs hunger. Basket tries it: "Anybody Around?!" Nobody answers. "Nobody's around, great."
Wrecked bases
Back on the Ice Road, Basket heads west and takes another portal up. It comes out by a little house in the middle of the water. A creeper hangs around outside, and Basket has no bow. The crops are "toast," and inside, "somebody just destroyed everything. Jerks. So I guess that means that not everybody's nice on the server."
The next exits go north, to an island crowded with buildings and a dirt plateau. Basket yells again and carries a melon as a gift. Still nobody. At one stop the signs tell the story: "Im sorry to see this base is destroyed, it looked awesome," "It was just a Platform for The portal," and one more over a chest of supplies left for new finders.
Basket chops down a tree for wood and replants it, and grumbles at getting "only three saplings from that?" With the sun going down, it's back into the Nether.
A picked-over fortress
Heading north through the Nether, Basket hits nether brick. "Oh, yes! Jackpot." Without a bow, the blazes are a worry, but "if I die, I die, and I'll be back at base." There are pigmen, but no blazes and no nether wart. "This area is pretty well picked over."
The first call
Then the chat flashes "Incoming call from Senior_Lo, pickup a smartphone to answer." Basket answers with "hi" and pulls up the cellphone help page again to make sure. It works: "cool, first time using cellphone." Basket adds, "I haven't seen anybody yet on this server." Senior_Lo writes back, "neither have i," and asks how the base is going. Melons come up. Senior_Lo's group has some.
Then the chat reads "Hung up call, lasted 1 m 53 s." Basket hung up by accident. The chat then shows a call with Quad14, who explains: "u type the person u wont to call bby holding the phone." The second call to Senior_Lo goes better. "didn't know I had to keep it in my hand lol."
Divide by eight
Senior_Lo wonders how far apart their bases are. Basket has been wandering "for about an hour and found nadda," so asks to come visit. Senior_Lo's base isn't in the Nether, and the location gets sent in chat. The video covers it with a "Censored" box. "Just gotta divide by eight." Basket sprints down the Ice Road toward it, finds another portal and says, "on my way." The end card comes up before Basket gets there, with no gameplay after it.