My CDMA/Analog Kyocera 7135 can choose A preferred or B preferred; it can also be set to analog only or digital only. Obviously, it won't work on TDMA or GSM, but can be used on a manually forced analog A or B. Not that I would have any interest in doing so, however, because I would prefer to have more than a minute or two of battery life.
Michael D. Sullivan Bethesda, MD (USA) (Replace "example.invalid" with "com" in my address.)[TELECOM Digest Editor's Note: Is the battery drain _that_ dramatic between analog and digital (you said 'prefer to have more than a minute or two of battery life'). PAT]