The ZAGGKeys Flex is one of our favorite go to Bluetooth keyboards for the iPhone 6 Plus and other smartphones. It is a small and slim keyboard that connects to the iPhone 6 Plus easily and the shortcuts at the top control an iPhone or with a switch can control an Android device.
The battery life is wonderful and it is easy to type for hours on this keyboard when you need to get some work done without a laptop at hand. The case doubles as a stand.
$32.95 at Amazon