The Z750i is a 3G handset and my review sample came from 3 where it is a freebie on various contracts. It is a clamshell phone and ostensibly could be seen to share some features with the Z555i which I looked at a couple of weeks back. But the Z750i is a superior handset in every respect, from its outward design right through to its features set.
So, you'll have worked out already that this is a 3G mobile. It is an HSDPA supporting handset and is also quad-band GSM so it should be able to get a connection pretty much anywhere.
Purple is one of the colours of the moment and this mobile is exclusively in purple on 3. Or rather I should use the description Sony Ericsson prefers, ‘mysterious purple'. Your other colour choice is ‘platinum silver' which 3 can also do for you. I have to say that the purple, which is rich and dark, is rather nice as a colour, but I prefer the matte metallic back of this handset to the mirrored and Christmas decoration-ish front. Neither is in any way mysterious.
The front fascia looks plain unless its embedded OLED display has a reason to spring into action. The display is a mere 36 pixels high and 128 pixels wide, and appears lengthways on the front of the phone. It'll kick in to show what tune is playing, or let you know who has sent an incoming SMS message or who is trying to phone, for example.
I found that it isn't as clear as some. Its pale lavender-coloured text is only really noticeable if you are looking for it. A sideways glance at the phone while it's sitting on a table often isn't enough. I had to pick the phone up to see what the OLED display was trying to tell me quite often.