BlackBerry Curve 9300 used GSM 3G HSDPA / UMTS Technology for its Networks carrier and the BB Curve 9330 used CDMA Networks Carrier, the others differences between those two including the Internal Memory, Color Body and also the Weight.
Forget about the specifications of Blackberry Curve 9330 and 9300. Just like what the title of this post said, if you looking for Yahoo Messenger for BlackBerry Curve, you can just download from the official site of Yahoo Messenger for BlackBerry at blackberry.com or at yahoo.com.
Though you can also used Multi Protocol Mobile Messaging Client for Blackberry to connect to Yahoo Messenger.
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