Over the last several years, the ubiquitous use of mobile phones by people from different cultures has grown enormously. For example, mobile phones are used to perform both private and business conversations. In many cases, mobile phone conversations take place in public places. In this chapter, the authors attempt to understand if cultural differences influence the way people use their mobile phones in public places. The material considered here draws on the existing literature of mobile phones, and quantitative and qualitative work carried out in the UK (as a mature mobile phone market) and the Sudan (that is part of Africa and the Middle East culture with its emerging mobile phone market). The results presented in the chapter indicate that people in the Sudan are less likely to use their mobile phones on public transport or whilst walking down the street, in comparison to their UK counterparts. In addition, the Sudanese are more willing to switch off their mobile phones in places of worship, classes, and meetings. Implications are drawn from the study for the design of mobile phones for different cultures.