First, I want to give credit to this Amazon reviewer who saved me much frustration - her instructions for pairing with iPhone worked identically for pairing with my HTC One droid phone. [...] Thanks Melissa! To summarize:1. Put in 2AA batteries, open keyboard, then hold down Ctrl + Fn blue + Fn green to activate (green light on keyboard should flash - may already be flashing).2. Under settings on the phone, turn Bluetooth on and then tap the Bluetooth icon to search for devices.3. Click "Think Outside Keyboard" and follow the pairing instructions by typing the code provided onto the keyboard. As Melissa writes, "Make sure you hold down the Fn blue button because you're typing in numbers." That's critical!!!!!! Then hit enter.4. Type away!This keyboard is super easy to use and weighs under 6oz, so it's perfect for my upcoming backpacking trip. So far I haven't experienced any lag or difficulties. Opening and closing takes a little getting use to. Nothing to complain about!