I posted back on page 20 regarding this problem. Having your iphone contacts turn on "send as sms" did not fix the problem for me. 60 hours after Apple revoked my certificate, my son's iphone, with "send as sms" turned on, still would send me an imessage that would never get delivered, and the bubble on his phone would stay blue, and never say delivered. So, imo, based on the evidence of my own testing, having your contacts turn on "send as sms" is not a definitive fix.
The explanation that the iphones are not pulling updated contact information seems plausible. As to the cause of this, or the motives (if any) behind it, is speculation on our parts.
In any case, this is a real problem that needs a solution, and that solution must come from Apple. All the tweaks in this thread did not fix the problem for me. I was still missing texts sent to me by family members, especially group texts. "It just works" does not apply in this case.
I have used Apple products since the Apple II. Currently I have a Macbook, an iMac, a Mac Mini, an ipod, two iphones, and an ipad. Since this problem occured for me earlier this month, I have mothballed the iMac and turned my Mac Mini into a dedicated computer for my weather station by installing Parallels and running Windows on it 24/7. I still use my iphone 4S for a couple of programs that I like better on IOS than Android. I was very close to buying a Macbook Pro this month, but I have decided that I will not continue to invest in the Apple system. There are other reasons for this besides that problem with iMsg I have had, but its fair to say that the iMsg problem was the final straw for me. So this iMsg problem has caused Apple to lose at least one customer.
I chose to end my problems with iMessage by changing my phone number. It took me about five hours to change all my contact info at various places, and consider it time well spent. No more iMsg problems for me. Good luck to those of you who are waiting for a fix.
Message was edited by: larryhutch for grammar