1. A method for passive enrollment of a user in a speaker identification (ID) device, the method comprising: parsing, by a processor of the speaker ID device, a user speech sample, spoken by the user, into a command phrase sample and a sample of a keyword phrase; identifying, by a text-dependent speaker ID circuit of the speaker ID device, the user as the speaker of the keyword phrase sample; associating, by the processor, the command phrase sample with the identified user; determining, by the processor, if the command phrase sample in conjunction with one or more earlier command phrase samples associated with the user is sufficient command phrase sampling to enroll the user in a text-independent speaker ID circuit of the speaker ID device, the command phrase sample and the one or more earlier command phrase samples together making up at least two command phrase samples associated with the user; and enrolling, by the processor, the user in the text-independent speaker ID circuit using the at least two command phrase samples associated with the user after the determining there is sufficient command phrase sampling to enroll the user in the text-independent speaker ID circuit.
10. The method of claim 1 , wherein the keyword phrase is one of a greeting, a wake word, or a wake phrase.