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I have Java on my cellphone, I also have Opera already on it however... and NetFront beats it there, and Openwave on my older phone... doubt this version will be much better, as it can't share much of the codebase if its a Java app
Opera Mini is to be used with low-end java-capable phones that might come with a WAP browser or not, or they only come with the crappy SonyEricsson or AU/Teleca or the native Motorola browser.
Many phones come with the capable Openwave 6.2/7.x or NetFront browsers, however it's always nice to have a fallback, and so Opera Mini is a good choice for these phones too.
If you already have a smartphone though (Symbian, WinMobile or PalmOS based), chances are that you already have a better browser installed for you, including maybe the Smartphone version of Opera (which differs from Opera Mini as it's more feature-rich).
BTW, the first browser to feel the heat from Opera Mini is RequirelessWeb WebViewer which is also a J2ME browser for low-end phones. However, it ain't free, and it seems that the company went already busted (their products web pages are not available anymore as they used to be).
It is much better and beats the crap of any other browsers on handsets. It's based on Opera 8 even thought the actual parsing and rendering is not done on the phone.
As I said above, depends on which handset. SonyEricsson, AU/Teleca, WebViewer, WAP-only and Motorola browsers are not that good, and so Opera Mini is a good alternative. Nokia's native browser is on par with Opera Mini from what I understand. But when it comes to Openwave's 6.2.x/7.x+, Netfront, IE and smartphone Opera, Opera Mini can't compete (for example, I noticed that centering does not work with Opera Mini yet, neither table borders). So, depending on what browser you are using atm, Opera Mini can be seen as a good upgrade, a mere fallback, or not as good. It all depends on what kind of cellphone you got right now.
> I also have Opera already on it however... and
> NetFront beats it there
NetFront beats Opera Mobile (not Opera Mini)? Would you mind explaining how it beats Opera on mobiles?