The good: Very stylish, yet simple design; excellent tactile feedback on buttons; quadband GSM with triband HSDPA; Bluetooth stereo; unified media browser.
The bad: Glossy surface a fingerprint magnet; dated camera features; image quality average at best.
The bottom line: Even with a pretty shell and excellent keys, the Z750i's dated camera, disappointing image quality and dodgy A-GPS feature somewhat marred the whole user experience.
The Sony Ericsson Z750i was announced toward the end of Q1 2007 and it marked the Japanese-Swedish company's foray into the HSDPA market. At this time, if you're thinking the Z750i looks familiar, it is. In fact, you'll be hard pressed to find any major differences between the Z750i and the earlier Z610i.
Design
We have to admit sheepishly that we really like the stylishly designed Z750i. Part of the reason, we suspect is the Japanese "kei tai" (mobile phone) allure which has typically followed the clean and simple design philosophy. Like the Z610i, the Z750i retains the seamless mirror-like surface with a hidden OLED screen. When activated, the screen illuminates to give the effect of a floating display on the surface. If you look at it from an angle, it appears as though the various "layers" of the screen extends into the handset, giving it depth and a three-dimensional feel. The OLED screen displays incoming message alerts and calls, music information and in idle mode, the time, battery level and signal strength.
The only cosmetic differences we find between both handsets are the Z750i's matte-plastic backing, taller spine (the part of the bottom lid that extends above the top cover), inclusion of call/end keys and the slightly different layout of the buttons.
Features
Although the Z610i and Z750i are like peas in a pod on the outside, the latter is more advanced in terms of features. For example, the quadband Z750i is now on the GSM 850 frequency and it also offers triband HSDPA which add to its network compatibility in the US. A little less known fact of the Z750i is that it comes with built-in A-GPS receiver. This is a little different from Nokia's N95, E90 and the 6110 Navigator which have built-in GPS chips. The Z750i relies on an assistance server such as a cell phone tower to triangulate the user's position.
According to Sony Ericsson, this feature requires the telco operator to activate the A-GPS capability and, from what they understand, only Chunghwa Telecom in Taiwan has enabled this feature. They added that the A-GPS receiver can also connect to GPS satellites, although it will take a longer time to get a location fix. We tried the A-GPS feature during our review, but we never managed to triangulate our position. The way we see it? The proposition of the A-GPS here is somewhat dodgy and we recommend users to take this with a huge pinch of salt. On the brighter side of things, Google Maps is preinstalled on the device and you can use this as a standalone app. However, not all the features are enabled and traffic information is one of them.
Performance
Overall, the performance of the Z750i was nothing to shout at. While the phone was pretty responsive when opening applications etc, running multiple programs such as music playing in the background and texting a message slowed the handset's response significantly. Picture quality was a mild disappointment. Granted that the Z750i isn't positioned as a camera-phone like its Cyber-shot counterparts, picture quality from the 2-megapixel camera was constantly marred by a watercolor effect. The lack of autofocus also contributed to numerous out-of-focus shots during our tests. At best, we'd give the Z750i's camera an average rating. The Z750i is rated for 10 hours of talktime and slightly over 16 days on standby. With regular use of sending text messages, making phone calls and listening to music, the 930mAh Lithium-polymer battery lasted for two days tops before it had to be juiced. Audio quality was decent and we had no problems piping music to our HBH-DS980 Bluetooth stereo earphones during our review.
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