Jambo! Venice is a beautiful maze, and offline maps rarely cut it. Install a JamboSim eSIM before you fly and land at Marco Polo already online.
Terminal Wi-Fi works, but you will want data for vaporetto tickets and finding your hotel on foot.
The Alilaguna water bus goes straight to Venice, and ATVO buses reach Piazzale Roma in about 20 minutes.
VCE has one passenger terminal. Local time is CET/CEST.
Yes, your phone joins an Italian network as soon as you land.
Yes, coverage is the same across Italy including Murano and Burano.
Install before departure and activate on arrival.