I stupidly bought an iPhone 5S to replace my splendid HP Pre3, only to find it cannot do imap idle with my mail server which renders it useless as a business tool plus it has the most convoluted UI I've ever used. Before I buy either a Nexus 5, Galaxy S4 or HTC One, could somebody confirm that the built-in email app does idle or there is a third-party add-on to do it? I need a phone which shows me an email a second or two after it arrives on my mail server, not up to fifteen minutes later like the iPhone. That's it. Any other apps or niceties are a bonus.