I just really hate those long layovers. Once, my flight was delayed, and instead of 6 hours, I ended up waiting 13! I got really tired from waiting back then. Thankfully, at least there was a café with comfortable chairs. The Wi-Fi at the airport is quite good; I had to work there while my flight was delayed. Just in case, I’ll leave you their website:
https://lisbon-lis-international-airport.com/ . It has detailed navigation for Lisbon Airport and answers to many questions. The connection process doesn’t require SMS verification. The connection speed is more than sufficient for checking email, watching videos, and downloading documents. However, for high-quality video calls, the network may be less stable during peak times at the airport. The most stable signal is found in the waiting areas near the boarding gates in the international sector. Which terminal will you be waiting in for your next flight?