Plant it to grow Telephone. It's a phone! Dial it with your wrench. Growtopia doesn't have any cell service, so you're stuck with this old thing.
Telephone Seed price in Growtopia: sells for about 2 WL (median of 1 offers from community Discords, past 30 days). Live price chart and the latest buy and sell offers.
Recently sold at: MDGZ