EPUBs thru Calibre in WP8

I have been looking all over to find the answer to the following questions myself, but I just can´t find conclusive answers. So I´ll post them here. If they are slightly off topic, sorry, but I am new to this. Questions are:

1)I am looking to buy a WP8 phone (Samsung Ativ or Nokia) and I want to make sure I can use Calibre to write epubs from my lib to that device. Is this possible?

2)Also, I would need a WP8 ereader app that reads books locally (=from the device), not from the cloud. Does such an app exist or do I have to convert every EPUB into Amazon format and use Amazon WP8 app?

Thanks in advance.