cannot send text message

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http://forums.androidcentral.com – I just picked up my S4 today and I can receive but not send text messages. I have tried on wifi and on 4g. Also with stock messaging app and handcent. I have also turned the ohone off and back on. Any other hints/suggestions or maybe a fii do get a kessage failed to send pop up, but no error code or reason. (HowTos)