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)
1 Tap Call Call rejection to configure these options: 2  Auto reject mode: When All numbers is selected, calls from all numbers are rejected. 3  When Auto reject numbers is selected, calls from numbers on the Auto reject list are rejected.