Yep, read that link posted above! Your phone is simply a wi-fi hotspot when you turn that function on. The issue is the "unlimited" data plans usually hit a wall on speed at some preset number depending on your carrier, say 15gig of data use. We travel with two phones and one tablet connected to Verizon, each can be a wi-fi hotspot with those limits. We use the Roku and Youtube TV, very pleased with the combo. We don't watch TV a lot in the RV but don't forget you have an antenna and amp for locals which helps keep your data usage down with the ROKU.
Bill and Brenda + Mobius Big Dog
2018V24D, '13 Tiffin BR32, Tiffin 34TGA, '11 Aspect 30, 06View23H, '00 HHiker II 5W