This study explores the antecedents and consequences of customer engagement behaviors in the Thai mobile network business. This study found that the approach to switching behavior and cross-buying behavior is connected to customer loyalty behaviors. However, the spending behaviors of customers may not be a good indicator of customer loyalty in the mobile network business because those who do not have the intention to switch to another brand do not necessarily increase their spending. In addition, most respondents are concerned with competitive promotional packages, which influence customer engagement behaviors. Hence, it was proposed that service quality and competitive promotional packages are antecedents to customer engagement behaviors and all these factors are important in explaining customer loyalty toward mobile network providers in Thailand.