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)
Samsung Galaxy S4 has a Reject List feature that will help you block the unwanted numbers on your phone. To block phone calls on Android SGS4, follow these steps: 1  Go to Setting and then tap on My Device. 2  Now select Call and then Call Rejection; here you will find a Auto Reject list.