– The picture shows the word “Roll" above (or over) a line of three clocks showing the same time. What you need to understand about this game is that pictures can convey multiple meanings and a lot of alternative meanings. This time, the clocks read “minutes." The picture thus represents roll – over – minutes.
– This is an expression used mostly by mobile services providers and it means that if you didn’t use all your minutes on your cell phone, the rest of those minutes are rolled over (or transferred to) the number of available minutes of the next month.