So today I got new internet provider and I don’t have the original remote to hook up my new internet services and my mobile remote can’t pick up my Roku device. How do I fix this problem
Simple - get a remote. You can't use any app to control your Roku until it's connected to the network and you can't get it to connect to your WiFi without a remote. If it's anything but a stick, you can get a cheap universal IR remote that supports Roku. If it's a stick, you need a Roku remote. If it's a purple stick (model 3500), you're SOL. They no longer make a remote.