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I did a hard restart and seems to have fixed it for now. i also enabled "send at sms when imessages isn't available" it was off by default
 
Not only an iOS7 problem

I had this problem with my 2iphones 4/4s on IOS6 also. It seemed to happen when I moved SIM cards around to change phone numbers.

Iamthinking some configuration or iCloud issue is to blame. Just turned imessages off on my phones since unlimited texts are free anyhow. Problem solved.

-Iamthinking
 
They need to edit this post because resetting the network settings DOES NOT FIX THE ISSUE!

This is a temporary solution and the problem will come back eventually.
 
I have a similar issue. I got the iPhone 5s on t-mobile and I cannot receive picture messages. I've tried every reset known to man!! Lol and still can't get it to work. And I still can't get visual voicemail. I'm on the 15.1 carrier update.
 
You don't need to do this. Just set each phone with a separate iCloud acct, and install and turn on Apple's FindMyFriends on each phone. Then you can check on all your kids from one screen, the FindMyPhone screen.

We've been round and round on this. FMF doesn't do everything I need. Have to have FMI.
 
Where is a setting that lets me tell if the message was read by more than one party? AKA the NSA?
 

If having issues with iMessage and Sprint call them and ensure they have the correct ICCID provisioned that matches your iPhone. Also, if you have Sprint and integrated Google Voice then yes that may cause iMessage issues and you may only be able send iMessage using your AppleID, not with your phone number.
 
The reason they don't fall back to text messages is because that setting is off by default in iOS 7.

Settings > Messages > ~Send text if iMessage fails
 
The reason they don't fall back to text messages is because that setting is off by default in iOS 7.

Settings > Messages > ~Send text if iMessage fails

Even with that on it didn't work for me. Very poor as I had no idea messages where failing until I got phone calls chasing up. :eek:
 
Same issue on my iphone this evening after updating to iOS 7.0.2. Sending an message appears to start, blue bar moves across on the menu bar above the message to indicate transmission, then pauses with about 10% to go, status remains as "sending". Happened on my iPhone 5 today, happened on my freinds 4S yesterday, exactly the same symptoms. :(

In my testing i attempted to restore both phones, then set up as new phones, signed in with AID, carrier settings were updated and icloud was used to sync contacts back, issue was resolved at first but then came back. Didnt notice issue until tonight when nobody was replying to my messages. Thought to myself, ok i may have pissed one person off, but i KNOW i havent pissed everyone off! Ended up having to tap on msg and use the 'send as text message' option.
 
iMessage is the single biggest battery-suck on my iPhone 5 and has been since iOS 6. The constant live/syncing aspect needs toggles to turn some of that off. The syncing drains my battery even when a conversation is happening on my desktop. I love iMessage and I hate iMessage. :) :mad:
 
That's not the only thing. A few things were a little bumpy in my iOS 7 transition. Mail didn't have any of my mailboxes until I force-closed it then opened it again.

Other than that, it's ready. The only serious problems are the sometimes ugly icons and UI and the lack of a jailbreak. Come on, I thought they were releasing the iOS 7 jailbreak soon :(
 
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Many users are reporting that these failed iMessages are also not falling back to traditional text messages as should occur when iMessage is unavailable. Instead, the iMessages simply hang during the sending process and eventually show as undelivered.

Article Link: Resetting Network Settings May Fix iMessages Not Working in iOS 7

I do believe the reset worked. As for the messages not reverting back to regular texts before the reset, my iMessages were doing that i.e. the green texts as opposed to the blue ones.
 
That's not the only thing. A few things were a little bumpy in my iOS 7 transition. Mail didn't have any of my mailboxes until I force-closed it then opened it again.

Other than that, it's ready. The only serious problems are the sometimes ugly icons and UI and the lack of a jailbreak. Come on, I thought they were releasing the iOS 7 jailbreak soon :(

I too had a mail issue: When I first started my iphone after the update, my gmail account had some 10,000 unread messages!!

The fix was a bit tedious: to log into gmail, in my browser, on my computerand select all as "Mark all as read". Sounds fine except that I could only select about 50 at a time. So, this was a great use of time :/
 
Com'on Apple!
Get with the fixing! Why bother having developers and beta versions if something this glaring gets overlooked!?!

I shouldn't have to be re-starting / resetting networks settings, etc to make this work (which btw didn't work for me!!!!!!!).

WTF! >:-l
 
Both 5 and 4s ad the same symptoms, a simple phone restart sorted the issue. Whether it stays fixed remains to be seen.
 
FWIW, check Settings/Messages/Send as SMS.
I had to turn it on after upgrading to iOS 7.

True it may be off by default, but it doesn't switch. It hangs at like 90% and never sends

Hmm, I'm curious though. Does it have to say "not delivered" when it hasn't been delivered? Just sent a text and my friend didn't receive it, even though I got no error message. Do you guys always get the error message when the text hasn't been delivered?

I had one take over 30 minutes without finishing "sending" yesterday.

Turning the device off then on (just normal slide to power off) works for about a day. Started with 7.0.2 for me and my wife.
 
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