Text messaging help please!

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http://forums.androidcentral.com – I have a new Galaxy S4 and was buzzing along fine until yesterday. I can receive text messages but an getting a message failed error when I try to send one. I took out the battery (twice just in case) and found the application area and cleared data (one of the messages I read here said to try that but the battery reinstall worked for that person). Any ideas? (HowTos)