The Android/iOS Roku app is primarily intended as an alternate remote control device for a Roku device. The only thing one can stream with it is Roku's own The Roku Channel, but I don't know if you can do that without having a Roku device and account to connect it to.
You CAN use a web browser on a computer or mobile device to view The Roku Channel via therokuchannel.com.
The Roku Channel is currently available in the United States, Canada, and the United Kingdom via Roku streaming devices, internet web browsers, and mobile devices. In Mexico it is available on Roku streaming devices only. (Source: From "How do I get The Roku® Channel?" page - https://support.roku.com/article/360007223934)
Roku Community Streaming Expert
I am not a Roku employee, only a user like you. Please, no support questions via private message -- post them publicly to the Community where others may benefit as well.
If this post solves your problem please help others find this answer by clicking "Accept as Solution.".
Ultra 4800 | Streaming Stick 4K+ 3821 | TCL Roku TV 43S245/C107X
