What's the best app/widget to use to check the price of bitcoin on your phone? Why that one?
Discussion
I like Bitbo personally- just due to the features and info it provides. Good log chart, reflects fee rates etc. lots of stats & a btc calculator
Likewoah's telegram channel that publishes each new block 
Do you look at it every time a block is found? Seems a bit noisy to me
No. I like how quirky it is that someone built the bot is all. And when I find myself wanting to look at the price, I like seeing other data. Warning: he drops nudes in there woth certain numerical triggers... I once opened it at kids' baseball game... Not a good look.
Block screen. I don't know if it is "the best," but it does exactly that job and is super easy to configure.