One of the things we really like about the Vivaz is the quick and easy access to the dial pad – something that is often hidden away on touchscreen phones.
On the Sony Ericsson Vivaz it sits at the front of the home screen as a grid - you won't know what it is the first time you take the phone out the box, but it's handily placed.
There are also various simple ways to access the contacts book - through the menu, dial pad or by hitting the call button.
Sound quality when making and taking calls with the Sony Ericsson Vivaz is fair, we didn't experience any major issues.
Both the caller and the recipient's voices were clear and comfortable to hear, although there was some occasional buzzing on the Vivaz's end.
The contacts book is pretty basic, just an alphabetical list of names, but there is the option to segment them into groups.
The individual contact entries are a bit more exciting, with room for multiple numbers and email addresses as well as company information, job title and photo to help you remember who's who.
Favourite contacts can be saved to one of the five home screen tabs for quick and easy access. But unlike the INQ Chat 3G and other phones of this calibre, there is no option to synchronise your phone book with your social networking profiles.