We have Sprint’s Samsung SPH-M520 and SPH-i325 (the BlackJack Ace) user guides, available for download.
The SPH-M520 is a mid-range phone, replacing the SPH-M510. The M520 builds on the M510 with a new slider design, replacing the M510’s conservative flip form-factor.
The Samsung Ace is Sprint’s version of the BlackJack. Combining elements from the BlackJack and BlackJack II design, the device has access to the full range of Sprint services: Sprint TV, Sprint Navigation, Sprint Music Store, and Power Vision EV-DO data.