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sim900a doesnt send the valid message detail to microcontroller

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amintlk

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hi .. i used sim900a before and it work well .. but recently i use another sim900a again but when i send AT+CMGR=1 for sim900 to read the message detail it feedback me these

+CMGR: 0,"",26

0791893905004100240C918939556271820000511172310320410748341A8D46A301

before that i received +CMTI: "SM",1 correctly
... when i send AT T it feedback me OK
and when i calling the number it feedback me RING RING


what's the problem? is it need upgrade?
 

You have apparently set the SMS mode to PDU. (+cmgf=0)
 
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