If you want to download music using SingTel's AMP service, there's now an iPhone app for that.
For $9.90 a month, you can sign up for Broadband on Mobile AMP, a value-added service by SingTel Mobile that allows subscribers to download music. There are no data charges for downloading the music and users can keep up to 15 tracks a month.
SingTel AMPed is free, but you need to be a subscriber to the AMP service to use this app. It can be downloaded here.