Series 3 and Series 4 watches are also the most visually distinct due to the S4's significantly larger screen. S0-S3 are all identical, aside from the red dot o

Series 3 and Series 4 watches are also the most visually distinct due to the S4's significantly larger screen. S0-S3 are all identical, aside from the red dot on the side of the LTE S3 and minor (1-2mm) changes in dimensions.