![]() ![]() If the person you're calling doesn't respond after about six rings then "Trouble with reaching 'Name'" pops up on the screen. In my house the problem seems to revolve around whether or not the person receiving the call is on Wi-Fi or mobile broadband – it generally works fine when they're getting 30 Mbps from the Telstra 4G network but incoming calls don't always pop up when they're connected to the home Wi-Fi network relying on a crappy 4 Mbps DSL connection. Other times it refuses to acknowledge an incoming call unless your phone is unlocked and the app is open. Sometimes an alert pops up on your lock screen and the phone chimes. Tested between iPhones and with Android devices, Google Duo isn't completely reliable. There's no button to disable video and make voice-only calls, although if your battery is running low you're offered the option to disable video when making a call (at least on an iPhone, I don't know if the Android app also offers this option). The app's settings are rather sparse but you've got the option to block specific numbers from your address book and limit mobile data usage. ![]() A green "Your video is visible" message pops up to remind you that they can see you.Īpart from that the app is pretty basic, you can switch between the phone's front and back camera, mute your microphone and flip the interface so you see yourself in the big picture and the person on the other end in the corner (handy when you're using your rear camera to show them something). You can switch it off in the settings but you can't disable it on a call-by-call basis. Knock Knock is a cute feature when you're expecting calls from family members who want to wave, but the novelty might wear off. ![]() If your iPhone is unlocked and the app is open Knock Knock works fine, as you can see from my screen shot of Chewie waving. I suspect the point they're trying to make is that Knock Knock doesn't work with the iOS lock screen the way it does with Android, so you can't see Knock Knock on iOS if your iPhone is locked – it doesn't treat it like a "real" phone call. UPDATE: Some reports say that Knock Knock does not work with iOS, but that is incorrect. Right: Once the call connects you can see your face in the bottom left corner. Middle: When Chewie calls you, you can see him waving. Left: Call Chewie on Google Duo and you're told he can see you. Google Duo's party trick is Knock Knock, which lets you see live video of the person on the other end before you answer the call – a bit like a peephole in your front door so you can see who is there. In that way it's more like Apple's Facetime than Skype which offers presence status so you know whether someone is online and available to talk. The app automatically detects if anyone else in your address book has installed Google Duo on iOS or Android, but it doesn't tell you if they're busy right now. Press it and you'll see your address book, with fellow Google Duo users listed at the top. Now the app fires up your phone's front camera, showing your face and a single button: Video call. The app also needs access to your microphone, camera and address book, as you'd expect. You simply download the app, tell it your mobile phone number and enter the confirmation code it sends you via SMS. You don't need a Gmail account to use Google Duo. Right: Flick up to see a longer list of most recent calls. Middle: Launch the app and you see the Video Call button and your most recent calls. Left: First time you use the app, you're told Knock Knock is enabled. ![]()
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