Its still the same in the 4.5 public beta.   Increasing the number of characters displayed for the phone number would certaily make the address book more usable as an address book perse as there would be no need to select the individual entry to see the whole number perhaps you should post this in the wishlists section.

In an address book, the maximum field width for displaying telephone numbners seems to be limited to 11 charcters.  The full number is displayed in the right-hand pane when a specific entry is highlighted in the left pane, but the left pane display truncates phone entries.

In order to "neatly" display telephone numbers (with appropriate spaces/dashes between country/city/area codes/etc.)  at least 15 spaces are needed.  The field width is adjustable in the window, but the number of characters displayed is still capped at 11.

This error has existed in many versions of Pegausus Mail, and should be fixed.  Can we expect to see this correction in Version 5?