hi!App is the one-stop app for all your Singtel Prepaid needs with no data charges. Get the best deals and redeem rewards at your fingertips! Use hi!App to: - Register and activate your SIM or eSIM - Track your balance, usage and validity - Top up or buy Ultimate/Data/IDD/Roaming Plans - Activate your roaming plan - Sign up for auto top-up Monthly Plans - Check your inbox for exclusive hi!Surprise offers. Available in English, Mandarin, Bahasa Indonesia, Burmese, Tamil and Bengali language.