1. A method of utterance verification in a mobile telephone, comprising the steps of: A. converting audible, voice utterances into sampled voice utterance signals; B. providing a first confidence score for a first recognition of an utterance based on the sampled voice utterance signals, the first confidence score for an utterance u relates to the ratio G(f(u); μ c , σ c )/G(f(u); μ e , σ e ) where: (i.) G(.; μ, σ) denotes a Gaussian with mean μ and standard deviation σ, (ii.) f(.) denotes an utterance-verification feature, (iii.) μ c , σ c are mean and standard deviation derived from training on correctly recognized utterances, and (iv.) μ e , σ e are mean and standard deviation derived from training on incorrectly recognized utterances; C. providing a second confidence score for a second recognition, separate from the first recognition, of an utterance based on the sampled voice utterance signals; D. computing a decision score which includes the product of said first confidence score multiplied by said second confidence score; E. making an accept/reject decision for recognition of an utterance using the results of said computing a decision score; and F. performing a function in the mobile telephone in response to making an accept decision.