Hmm, yea try Clear Data (in Android) or re-install the app. Maybe the authentication is screwing up. Clearing data should resolve it. Also if you're accessing via WiFi, it means you're signed in to the account. Try accessing MySingtel via WiFi, signing out of the account, then connecting to mobile network and opening MySingtel again (this should show basic info like call/sms/data usage without needing to sign in).
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