This document provides tips for foreign students in Singapore to minimize phone bills. It recommends avoiding making overseas calls and SMS, and choosing a lower local talk time plan. It analyzes the costs of overseas calls and roaming SMS through different carriers. eSky is identified as the cheapest option for overseas calls. The document also recommends using eSky's dial-pad and data plan to make free local calls, and registering eNUM numbers to take advantage of free calls between eSky users.