Friend of mine had some (non-Motorola) router that her ISP provided her and the only way to set it up was through an app. The first time I ran into this I couldn't believe it, there was simply no way to set this piece of s*t up without using the app, which (a) didn't work until we'd spent ages faffing around with it and (b) was just a glorified set of different wizards that let you set things up in a few fixed preconfigured ways.

I recommend telling the ISP that you do not own a smartphone.