[NEFARIOUS]

I don't own an iDevice, but if I did had one, I usually leave it on, as I do with Hangouts, Facebook Messenger and BlackBerry Messenger, especially for the latter since my source of side income uses the read receipts as a dispatch. Also, if I have an extremely urgent message and send something to someone that I KNOW for a fact doesn't check their voicemails (last time I ran out of batteries and had to use his, he had 32 messages waiting), then I even enable a request before sending it to someone like that.

To others, I have other "spamgating" methods; keep your personal number as friends and family only, get a Google Voice number, link it to your phone (but disable forwarding) then give/change that number out to banks, mailing lists, companies that need you to register a phone number, and BAM. No collectors, telemarketers or IRS impersonators harassing your main phone line (or at the very least, significantly reduced).