Options for connecting your team by voice:
- Both Android and iPhone support conference calling. The number of callers varies with phone models and carriers. My iPhone 6 with Verizon supports 6-way calling.
If your's does less, try chaining: A calls B & C, who call D & E, etc.
- Facetime supports up to 32 callers with Apple devices.
- E-Conference apps (Zoom, Skype & similar).
- Some combination of the above.
One team member can run the Triva game on their device, and moderate by voice with the others. Or all members can login as the same team, and watch/contribute to the team's effort.
Any device with a web browser and an Internet connection should work, including desktops, laptops, tablets, and smart phones.