I use the 'you version'
iPhone - Mobile - YouVersion.com: Online Bible app of the Holy Bible. I use it whenever I don't have my Allan Bible on me. It's convenient when I have to do a quick search, or look at different bible versions. Even more, its nice to have when I'm stuck somewhere and have nothing to do.
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Another reason I use it is because it has a Romanian translation, which I use when I am at a Romanian church