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I don't know much about Windows Phone or Android sideloading, but you can sideload all your books onto iOS devices using iTunes.
Just drag .epub files into the 'books' section of iTunes to get them into iBooks.
If you prefer to use another reader, you can sideload via the 'Device > Apps' window when your device is connected to the computer, likewise by clicking and dragging. The Kindle app requires that you convert your .epub files to .mobi, which can be easily done with Calibre.
Calibre also has a feature that automatically syncs its entire library with iBooks.
Good luck.
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