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(Pocket-lint) - Blurring the boundaries between mobile phones and MP3 players even further, Sony Ericsson's W950 is a phone that carries a hidden secret; a 4GB flash drive for storing music. But it is this good enough to replace two devices with one? We take a closer look.

Taking elements from the company's smartphone M600 model, the W950 is a flat fairly large phone.

At the core of the design is a large touchscreen display although Sony Ericsson has still kept a full number pad directly below this. The actual keys are hidden under the casing and we found this made it difficult to determine where one started and the other finished. While on the whole this wasn't really an issue it at times ended up with the wrong button being pressed. Very frustrating.

Also irritating as a right handed person is Sony Ericsson's decision to move the back key found on all its models to the side of the device next to the toggle wheel. We say irritating because is located on the left hand side of the device rather than the right BlackBerry users will be familiar with. It's the same with the M600i and it would be interesting to see if the lead designer on both was a lefty or righty. We suspect he is a righty.

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Get into the interface and the phone's menu system is virtually the same as every other Sony Ericsson handset with a couple of tweaks to accommodate that touchscreen. The homepage opts for a PDA-esque approach giving you quick checks on SMS messages, emails and phone calls, while the menu button takes you through to other options such as the music player.

The music offering is powered by Sony Ericsson's Walkman player and accessing tracks on the drive was just like having a large memory stick in your card slot. Accessing tunes, thanks to the flash memory rather than hard drive is very quick and as a music player the overall performance and ease of use is great.

To recap

It might have plenty of storage, but the W950 can't decide whether it’s just music phone or a PDA

Writing by Stuart Miles.