This app was mentioned in 3 comments, with an average of 3.67 upvotes
I use the app called nxbus mticket. A 28 day pass that let's me use any travel west midlands bus as many times as I want all day is about 64 quid a month. It's just a pass you keep on your phone and display when needed.
Just show your ticket and jump on, you'll be fine.
Not sure if you're allowed to post links but heres the nx bus ticket app: https://play.google.com/store/apps/details?id=com.justride.nxwm
Makes life a lot easier.
There's an app now as well. You buy a ticket show your phone screen to the driver. https://play.google.com/store/apps/details?id=com.justride.nxwm