This is just my fifth mobile phone and is the best of all them so far. I just went out for a good low monthly payment plan and not concerned much about the phone. I just knew every feature of the Sony Ericsson Z550a before going to the provider to sign the contract.
In fact the salesman told me the phone has no expandable memory options. Well I just inserted 1GB M2 memory stick in the slot that is visible when you remove the battery cover. Now the music, photos, and video storage capacity is much better with the 1GB memory stick.
I like every feature of the Sony Ericsson Z550a, the digital camera works great and the videos are acceptable for the 1.3 mega pixels and 4x digital zoom. One of the most unusual features is the FM radio receiver, very useful when you want to hear something different and works great.
This cell phone is made of a very durable construction and also is resistant to me. The keyboard is very easy to use. I had no problems with my Sony Ericsson Z550a at the moment, is working good. I will update if something goes wrong.