This paper investigates the association between Mobile Internet Use (MIU) and climate adaptation of Vietnamese coffee farmers. We find that farmers with access to mobile internet are more likely to take adaptation measures and obtain higher coffee yields using both simple regression and instrumental variable (IV) models. Our data suggests that the adaptation results are driven by changes in water and crop management practices as well as mediated by farmersÕ access to weather forecasts and farm price information. Policy support for MIU may enhance climate resilience of farmers in developing countries.