Main article: Multi-user MIMO. Recently, results of research on multi-user MIMO technology have been emerging. While full multi-user MIMO (or network MIMO) can have a higher potential, practically, the research on (partial) multi-user MIMO (or multi-user and multi-antenna MIMO) technology is more active.
There are two ways to decline a call on the iPhone. 1  By pressing the Sleep/Wake button. 2  By tapping the 'Decline' button onscreen (appears only when the phone is unlocked, as you've mentioned)
Answering a phone call is self-explanatory. When the call comes in, all you have to do is tap the green answer button. If you don't want to answer it, you can tap the red decline button and send the call to voicemail instead. You can also choose to answer the call on your iPhone or send a text message.When the call comes in, turn the Digital Crown or swipe upwards to access these options.f your iPhone is already unlocked, tap the green bar at the top of the screen. You can make phone calls to people on your Favorites list by pushing the Side button below the Digital Crown. Then, turn the Digital Crown or tap a person's initials to select. Then, tap the call icon in the bottom left corner of the screen.