A basic prepaid phone. These tend to be above the $20 mark so $15 is pretty good.
Locked to Optus, but see https://www.ozbargain.com.au/node/198960
This has a standard micro-USB for charging, so the next time a certain person loses a phone, I score an extra charger. I bought 2 at this price.
The Optus ZTE F286 is reliable and easy to use, with a variety of impressive functions including Bluetooth, FM radio and 3.5 mm earphone output. It also has an expandable memory which supports SD cards up to 8 GB so you can customise the storage space to suit your needs.
Screen: 2.4" TFT 167 DPI
Camera: 0.3MP Camera
Memory: 128MB (about 85MB available to the user)
Storage: Expandable up to 8GB
Processor: 611Mhz
Interesting, it has a physical keyboard.