blockchain is not an exchange, you can't buy from it
blockchain.info is just a block explorer, they don't sell anything
since you are a newbie, the "downloaded an app" part might contain a virus, better be careful
I don't know if I would use exchanges through mobiles
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You will be buying it from blockchain.info - they are not only just a wallet, the people behind it are into various bitcoin/crypto currency projects.
Hmm these 2 posts seem to contradict each other. Who's is right?
As of the first reply, i got the official blockchain.info app from the App Store? Same as the link from the website.