Most Sony Ericsson W900i reviews give the mobile phone glowing praise, and for good reason. Not only does the phone look stunning, it's jam packed with high quality features. The W900i was seemingly released to address the shortcomings of the Sony Ericsson W800i: bigger screen, bigger memory and 3G. Throw in a 2 megapixel camera giving great results plus excellent sound quality, and you have a great mobile phone with great looks, particularly in black. Only problem seems to be the size and weight of the phone (and the price!).

The CNet review of the Sony Ericsson W900i gives the mobile phone 7.4. CNet like the camera and image capturing abilities, plus the 30fps video recording and multiple connectivity options. On the downside, they found the W900i a bit big and heavy, with only mediocre battery life (although still good for 2-3 days). CNet conclude "If you can get pass the large form factor and steep price, the Sony Ericsson W900i is a powerful handset that should be meet most mobile imaging and multimedia needs." It's worth noting that the W900i is the same size as the S700i, so if you're happy with Sony Ericsson swivelling form factor, you won't have a problem with the W900i.

GSM Arena's review of the Sony Ericsson W900i also praises the W900i's features, but again questions the weight of the phone. They conclude "if you feel attracted to the conception of a music mobile phone, then you may have to make your choice between two Sony Ericsson models - W900 and W800. The more expensive option will bring you fast data and video conversations in UMTS networks, a bigger and better display, huge built-in memory and a pair of other less important details."

InfoSyncWorld love the Sony Ericsson W900i's excellent image quality, as well as the great sound it produces (which is to be expected, given the Walkman branding), rating it 87% overall. They note that the W900i doesn't support tunes downloaded via Apple's iTunes or PlaysForSure-variants (e.g. Napster and Yahoo! Music). It's fine with most of the standard file formats, though. Again, InfoSyncWorld dislike the camera's weight, but conclude that "...the Sony Ericsson W900i is the most powerful handset available at the time of writing. On top of that, the handset offers a slick and user-friendly user interface as well as excellent key- and navigation pads. Its size and looks, however, don't even come close to the competitors' offerings, and its heavy feature set naturally drains battery life quicker than ever. In summary, the Sony Ericsson W900i should satisfy the needs of most every user with the exception of small-pocketed fashionistas."

Mobile-Review are less positive about the Sony Ericsson W900i. They give a thorough review of the W900i and compare it with the older Sony Ericsson S700i, as well as a Samsung D600. They conclude that "the size of the W900i is too large, even for the UMTS-device of the current generation. Certainly, fans of the company will apprehend occurrence of this device at the market with delight, but for those for whom high functionality and support of UMTS is necessary, it is much easier to choose smartphones by Nokia (the smaller size, greater number of options and programs, plus lower cost already today)."