Purpose: This research aims to study the extent of customers’ acceptance of mobile payment services in Sudan during the political instability period, and critically analysis the impact of the war and lack of liquidity (cash shortage) on the intention and actual use of service. The study also adapts and extend the UTAUT model by taking into account factors such as system speed, political instability and illiquidity influence. Design/Methodology/Approach: The study takes a quantitative research technique to evaluate the relationship between many independent and dependent variables. The data have been collected using an online survey, statistical analysis is conducted using the SPSS software and SPSS AMOS 24. Findings: The empirical findings validate that the intention to use mobile payment systems and their actual usage during the Sudan war crisis is significantly and positively influenced by performance expectancy, effort expectancy, facilitating conditions, political instability influence, and illiquidity influence, while social influence and system speed found to have no significant effect of Sudanese intention to use the mobile payment system during the crisis time. Originality/Value: The importance of this study stems from the fact that it is one of the first studies to investigate the impact of political instability, and severe cash shortages on consumers' intention to adopt and use mobile payment services, coinciding with the ongoing war in Sudan.