Try this guide
Verify airplane mode is turned off.
From the home screen press the Center key.
Scroll to Setting and press the Center key.
Scroll to Others and press the Center key.
Scroll to Airplane Mode and if off press the Center key.
Press OK.
Scroll to Off and press OK.
Reset the network settings.
Resetting the network settings reconnects your phone to the network and does not erase any of your content or data.
If the problem occurred after you follow the guide, just try to replace your sim. Good Luck!
SOURCE: OmniaPro B7320. Unable to send/receive SMS. Can't access imbox.
visit our samsung b7320 orkut community.
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http://www.orkut.co.in/Main#Community?cmm=97086270
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U will be able to read sms by pressing msg buttion on QWERTY .the just scroll left or right.
SOURCE: Hi, i am unable to send sms's but i can
please contact your service provide for the message center number as it might have being entered wrongly.
SOURCE: i cannot send sms, but can receive sms and
check ur msg service center no. ang change it into default........
SOURCE: What does orange sms on screen signify?
Try deleting all or some of your texts, i think its because you might have to many texts.
I would replace it. Remember just an opinion.
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