Opera Software has released a major update to the Opera Mini 4 series, which is optimized for older and less powerful phones that don't work well or at all with Opera Mini 6. In my opinion, Opera 4.n is the best browser for Boost iDEN phones. Most of the Boost CDMA phones can run Opera 6 well but if yours doesn't 4.3 is the next best thing. According to Opera the changes from 4.2 to 4.3 are:
A fresh new look
Opera Mini 4.3 boasts a new and improved design, including a selection of great new skins for you to choose from.
Share links directly to major social network sites (Facebook, Twitter and My Opera) as you browse, directly from Opera Mini 4.3.
Click any Mobile YouTube video to launch it directly on your device's native media player (if available).
The app "Opera Mini 4" (130 KB) is ready to download or send to your phone as filename:"Mini43".
Author: Opera Software - Product Page, Online Help, Forum
Data Connection Required: Yes
Screen Size: All
iDEN Compatible: (tested on i776): Yes (no YouTube)
Boost CDMA Compatible: (tested on Motorola Rambler): Yes, including YouTube
Supported iDEN phones: All Falcon Series (MIDP2) with Java ( i9, i856, i776, i465, i290, etc.)
Filesize: 130 KB