I clicked "send as text message", now can never imessage person
I don't know if this is an iOS 9 problem or not but I've never had this problem before the other day.
I was using imessages to text with someone and it one of my messages was taking too long to send so I pressed "send as text message". Since that time, everything I'm sending is sent as a text message no matter what. I tried resetting my network settings, deleting the text thread and starting a new one, restoring a backup on my phone, resetting my phone, you name it. I tried this, and this, and this, all to no avail. It's frustrating beyond belief. Any help would be appreciated. Thanks.
iPhone 6, iOS 9.0.1