Stay secure! Do not share your OTP details with anyone over the phone, SMS or email. The Singtel team will never request for such information from our customers.
In your iPhone settings, tap on your Apple ID and select "Payment & Shipping". You might be asked to sign in.
Tap on “Add Payment Method” and choose “Mobile Phone”.
Choose “Use This Mobile Number” or “Use Different Mobile Number”, fill in billing details and tap on “Done".
Future purchases will now be charged to your Singtel mobile bill.