Explore a 21-minute conference talk from the ACM CHI Conference on Human Factors in Computing Systems that delves into digital privacy challenges in South Asia, where mobile device sharing is common. Learn about a proposed 'tiered' privacy model designed to address these issues, allowing users to create separate 'shared' and 'secret' accounts on a single device. Discover the benefits and trade-offs of this design through findings from a three-week deployment study with 21 participants in Bangladesh. Gain insights into how this approach aids digital privacy while also understanding the remaining challenges in shared mobile phone use contexts.