This seems to be a problem for a lot of people lately. I am sending text messages from an iPhone 5 to someone using a Galaxy S3 (T-Mobile). He has not been receiving my text messages which has resulted in a lot of frustration and miscommunication. It has become a real problem over the 4th of July holiday.
I have restarted my phone multiple times and am running the latest OS. These are standard text messages with no emojis. If someone could help me with this, it would be greatly appreciated.