Users will have 2 kind of charge: Subscription fee and usage charge per minute (Call forwarding charge)
Subscription fee (either monthly or yearly)
Subscription: The value varies slightly from country to country. For detailed pricing, please check out https://store.hoiio.com/#/DirectLine
Price included Tax and add-on DID
Call forwarding charges
Charges apply for Calls forwarded to destination number. Based on your account currency and destination number
Normally, it costs you 1.7c/m for Singapore locally.