answered about 15 months ago by Mike
The issue is not with the post office re the import taxes, these taxes are collected by the Customs Department. I am in business and import/export and from my experience with the Customs Department whatever you do with them you will experience difficulties. There are rules & regulations covering the situation you describe, and it should be possible to send the phone to Singapore and receive it again without paying taxes. However the Customs people are either unwilling to apply them, don't know the regulations, or do not have the necessary forms to complete etc. etc.
My advice, forget it, unless you can get the assistance of a savvy local importer/exporter.