MOBIVOX will read out up to nine contacts corresponding to the letters you have entered and ask you to press 1 for the first one, 2 for the second one, etc.

You can also try typing their first name instead of their last name or vice versa or rename one of your contacts if you prefer. You only need to type the letters of the name of the contact until it becomes uniquely identifiable. (e.g. If you have only one Zylber and no other contacts whose first or last name would start with W, X, Y or Z, you can simply type-in Z (dial 9 on your keypad).