Rough set theory provides simple and lightweight technique to classify mobile nodes in mobile grids. Mobile devices are resource constrained and hence rough set theory can be used for classification. The purpose of our work is to devise classification approach using rough set theory to classify nodes in a mobile grid. Here decision table contains node features which are used to classify nodes into Positive, Negative and Boundary sets. Proposed approach can be deployed on Android devices with anytime-anywhere computing paradigm. The novelty of our approach is that we applied non-computationally intensive rough set theory for efficient classification of nodes.