The two handsets share a number of features, such as Bluetooth, IR and USB connectivity, a 2-megapixel camera, media player and FM radio abilities.

Although both phones feature many similar features, the W710i adds a number of extra features such as an improved 'Walkman' MP3 player, pedometer functions, flash menus and it also includes a larger memory card (512 MB on W710i vs. 64 MB on z710i) and an improved stereo headset.

The Z710i is available in black (Twilight Black) or gold (Metallic Sand) colours with a blue on white external LCD display and the W710i is available in purple or grey colours with an orange on white external display.

The Z710i is also one of the first phones to use Sony's new finger-nail sized M2 flash card The Z710i comes in two colours, called "twilight black" and "metallic sand".

Sony Ericsson seems readily knowledgeable about the problem as their telephone tech support agents will readily give customers an answer which is the only current remedy so far.