The Sony Ericsson Z550a is the American version of the Z550i, offering quad-band functionality with the premium brushed metal and high gloss exterior. Featuring a 1.3-megapixel camera with 4x digital zoom and bright 262K-color display, the Z550a offers plenty of storage for pictures with 25 MB of onboard memory, expandable to 1 GB with Memory Stick Micro (M2) support. Consumers can also share photos using MMS, Bluetooth or email. A thumbnail gallery feature even makes it easy to search for the shots both visually and according to the date they were taken. The Z550a connects easily to a PC for fast transfer of multimedia files and synchronization with the phone book and calendar.
Phone Specifications| Camera | Connectivity | Data | Display | General | Input | Messaging |
| 2.0 MP | Bluetooth | GPRS | Color | Alarm | Predictive Text | Email |
| Video Camera | Infrared | Tethering | External Display | Calculator | Side Keys | EMS |
| PC Sync | WAP | | Calendar | | Instant Messenging |
| USB | | | GSM | | MMS |
| | | | MP3 Ringtones | | Text Messaging |
| | | | Picture ID | | |
| | | | Polyphonic Ringtones | | |
| | | | Ringer ID | | |
| | | | To-do List | | |
| | | | Vibrate | | |
| | | | Voice Memo | | |
| | | | World Phone | | |
| Operating System | Sound | Technology | Type |
| Java Enabled | Hands Free Slot | GSM Quad-Band | Flip Phone |
| Video Camera | Proprietary Slot | Tethering | External Display |
| Speakerphone | WAP | |
| Stereo Speaker | | |
| Voice-Activated Dialing | | |