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Welcome to the forums kizzy73 :)

Hopefully i can try and assist you today, otherwise feel free to post your issue here: Samsung Galaxy S3 - Android Forums

I would suggest trying to do a battery reboot, by removing the battery, reinserting it then restarting the device.

Otherwise you might want to see if it was an activation issue on your carriers end, or even call you carrier to ask if they are having connectivity issues.

Lastly, try downloading a messaging app like Handcent just to see if the issue is just the default messaging app or the whole phone.

Hope this helps and thanks for joining :)
 
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