Turns out you can read and write files on a BlackBerry using an iPhone
(iMore iPhone)

What you need to know Did you know that you can connect an iPhone to a BlackBerry? And if you did, what about transferring files? Turns out it works, and way better than you`d think. Welcome to the past. It sucks here. Remember BlackBerry? Sure you do. It`s the company that owned the smartphone market until Apple came along. Well, it turns out having your business taken away by a company you mocked isn`t as bad as it gets. Having your phone dragged out to show just how interoperable a modern iPhone is - that`s as bad as it gets. And that`s exactly what this video shows. We see an iPhone connected to a BlackBerry from the mid-2000s - admittedly, there`s a dongle involved - with various files and whatnot transferred between them. You can even use an iPhone to install `apps` on a BlackBerry, apparently. I`m putting scare quotes around `apps` because let`s be honest. These things aren`t apps. Not like we`ve become accustomed to today. Anyway, check the video out if you`v...