Motorola phones with voice dial require you to speak a voice tag to train the phone to dial a number associated with that tag. They have a limited number of tags and allow only one tag per contact. Many of the newer Nokia phones have speaker-independent voice dialing. Each contact has a voice tag generated by the phone. The phone compares your spoken dialog with the voice tag it generates. It repeats the tag and dials the number if you do not intercede. If you set a default number, the phone will always dial that number for the contact. If you call more than one number for the same person, you can choose not to select a default number. You then select one of the numbers from the screen. If you have abbreviations such as FBI, separate each letter by a space and make each letter uppercase. Otherwise the phone will pronounce the abbreviation as one word which is impossible for you to reproduce with your speech.