iMessage not working with one person.

Excellent advice. But rather than deleting entire conversation just delete the messages sent as sms. Meaning that initially I was sending imessages but my last 3 were sms. So I deleted only those 3 and after about 10 seconds it reverted back to an iMessage window.

Having the same issue too man, with just one person.

This just started happening to me this past weekend on Sept. 29. I've been using the beta since it came out for app testing. I haven't had any issues with iOS7 until this past Sunday. I had the same issue. One person I couldn't text. Then it started working later. Then today, the same thing happened. There was another person I couldn't message. I got their message, but I couldn't send. I could from my computer but that was it.

I'm having the same thing. iMessage went generally wonky last Friday, Sept. 27th. Now it's generally okay, after three restores, and daily rebooting. The exception is one person; we cannot send/receive via iPhone. iPad to iPhone is okay. Laptop to iPhone is okay. Totally unclear what's going on.

I am still having the same problem even after updating to IOS 7.0.3. I cannot imessage my daughter on my ipad 3 or my imac - it is working OK on my iphone 5s now. Also just found out I did not get an important voivemail on my uipdated iphone 2 days ago. Apple - you are a mess right now!

Yep, having the same issue. I can imessage to my colleague from my computer, but it shows up as a text from my phone. Not having this problem with anyone else.

I'm having the exact same problem as stated in the original post. Can't send iMessages to my mom's iPhone from mine. Everything else works fine with everybody else. AND it did work until one week ago!

I am not comfortable with "Just give it time!". I expect Apple to fix this bug...

I got a similar problem about that, my iMessage (especially after send and image to a person through iMessage ) couldn't send to a person. After rebooting of restart the iMessage many time, it becomes normal. However, it will happen again and again!! I was previously using iPhone 4S with iOS 7.0.3, the problem starts after upgraded to iOS 7, and now I'm using iPhone 5S with iOS 7.0.3, Same problem occurs! So I'm quite sure it is a firmware bug for the iOS 7 and I strongly request Apple Inc to take it serious and look into the matter. It cause a troubles to me and I really hope the problem should be fixed in the next upgrade.

I agree - APPLE NEEDS TO FIX THIS. It's ridiculous!

Okay, so it looks like if you power your phone down and back up it resolves the issue. And yes, apple needs to resolve this!

Thanks, Utah Gal!

Restarting my iPhone did resolve the problem. For now...

Have this problem and restarting did not work. Any ideas?

Restarting did not help me, either. My friend sent the following page, and resetting my network on my iPhone 5 still hasn't fixed it, but some of you may want to give that a try.

http://www.macobserver.com/tmo/article/having-trouble-sending-ios-7-messages-app le-has-a-fix-on-the-way

Also note: I am having this problem with ONE friend. I have verified that she does not have me being blocked. She doesn't use iTunes at all, so I've asked her what IOS version she's running, but I can't believe that is the problem, either.

NOTE2: Another friend of mine CAN iMessage my "ONE friend", I appear to be the only one that can't.

I may have found an answer. In checking various things, I noticed in my Messages settings that I had START NEW CONVERSATIONS FROM set to an alternate email address. When I changed it to the email address which is my Apple ID, I was able to send an iMessage immediately to that one friend.

Hope this helps someone else.