Relative newbie thinking about getting a Chessnut Go, but have some questions

Hey all.

I’m a relative newbie to chess. Ive been playing off and on against apps for a few months and am fed up of the 2D world. I’m keen to learn further and have a go at playing against other users.

I have a job where I’m in a car a lot of the day but have frequent breaks.

How’s the Go like for learning?

Can I start a game (say vs ai), then pause it, come back later?

Does my phone have to be connected with app open all the time to use, or can the phone go to sleep and it work in background?

I know the evo is probably the best option but is currently out of my budget.

I’d appreciate any input from you guys, many thanks!