Effective and rapid decision making during a pandemic requires data not only about infections, but also about human behavior . Mobile phone surveys (MPS) offer the opportunity to collect real-time data on behavior, exposure, knowledge, and perception, as well as care and treatment to inform decision making . The surveys aimed to collect coronavirus disease 2019 (COVID-19) related information in Ecuador and Sri Lanka using mobile phones . In Ecuador, a Knowledge, Attitudes and Practices (KAP) survey was conducted . In Sri Lanka, an evaluation of a novel medicine delivery system was conducted . Using the established mobile network operator channels and technical assistance provided through The Bloomberg Philanthropies Data for Health Initiative (D4H), Ministries of Health fielded a population-based COVID-19-specific MPS using Surveda, the open source data collection tool developed as part of the initiative . A total of 1,185 adults in Ecuador completed the MPS in 14 days . A total of 5,001 adults over the age of 35 in Sri Lanka completed the MPS in 44 days . Both samples were adjusted to the 2019 United Nations Population Estimates to produce population-based estimates by age and sex . The Ecuador COVID-19 MPS found that there was compliance with the mitigation strategies implemented in that country . Overall , 96.5% of Ecuadorians reported wearing a face mask or face covering when leaving home . Overall , 3.8% of Sri Lankans used the service to receive medicines from a government clinic . Among those who used the medicine delivery service in Sri Lanka , 95.8% of those who used a private pharmacy received their medications within one week, and 69.9% of those using a government clinic reported the same . These studies demonstrate that MPS can be conducted quickly and gather essential data . MPS can help monitor the impact of interventions and programs, and rapidly identify what works in mitigating the impact of COVID-19.