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)
Why These Apps Differ From *67. Dialing *67 before making a phone call will make your phone number show up as Blocked or Private on your recipient's phone. This is also the case when you change your iPhone's settings to block your Caller ID. This, of course, is not as inviting as seeing a real number, so your recipient may refuse to answer a call that you have manually blocked.