Ledger Wallet works on:
- Windows (7+)
- Mac (10.8+)
- Linux or Chrome OS
It requires Google Chrome or Chromium, and one USB port to plug the device.
Ledger Wallet can't run on iOS, because Apple mobile systems don't dialog through universal USB standard.
If you want to use your Ledger device on Android, you need to use it with Mycelium (for Bitcoin management).
Tutorial to use Mycelium: