Q: Iphone 5 iMessage group chat issues

I have an Iphone 5 currently running IOS 7.1 up until about thirty minutes ago I was able to send iMessages to a group chat I was in.  Now i cannot send them but I can recieve them.  However, my iMessage still works when sending messages to individuals.  I also cannot send SMS to the group chat either.  This is only off my phone, I do have iMessage on my computer and it allows me to send iMessages to the group chat, but not off my phone.