It's no secret that even though the Blackjack is an unbelievable Smartphone, battery life is a bit less than desirable with HSDPA use. (less than a full 24hr day for me....your mileage may vary).
But HowardForums member, pbogle, offers us a solution to turn off/on HSDPA data, based on his Samsung ZX20 experience. This leaves us Blackjack users with UNBELIEVABLY GREAT battery life under EDGE or GPRS data. (2 or more bars left by the end of the day for me with a decent amount of use).
The solution is an phone code to open a secret Admin Settings screen that will allow you to switch between GSM Data (Edge/GPRS) and WCDMA(HSDPA).
1. Enter *#1546792*#
2. Select Option 3 Netowrk & Call Settings
3. Select option 5 Network Mode
4. Select GSM
(Choose WCDMA to change it back when you need it.)
Now if someone could make a cool little app to quickly toggle these settings...we'd be all set!
EDIT: Read this thread for directions on how to make a shortcut to do this!!! HURRAY!