While I now use WhatsApp & Viber for most of my overseas call, I've just found that I need to call my bank back in Australia which requires the use of a normal IDD voice call service.
After some internet research, these are the best options I can find so far:
1) mytello - HKD0.13/min
- prepaid credit with no expiry (not sure what the min top up amount is)
- https://www.mytello.com/en_HK/rates/...s-to-australia
2) Skype - from HKD0.18/min + HKD0.38 flagfall
- prepaid (min Skype credit top up: HKD60)
- https://secure.skype.com/calling-rates/Australia
3) IDD1568 - HKD0.25/min
- post-pay service
- IDD 1568
4) IDT1529 - HKD0.28/min
- post-pay service
- HKD28 free credit for signing up
- Unbelievable 24-hour IDD flat rates
5) HGC0080 - HKD9/month for 100mins/month to certain countries
- monthly subscription (so probably more suitable for someone who calls these countries regularly rather than the occasional calls that I'm looking at)
- plans with more included minutes are also available
- IDD 0080/0082
I'm wondering if anyone here has had any experience with these service providers or have any other suggestions.