You select your contact and Vyke calls you and then connects you to the number you are calling. Callback should be used in countries where Local Access is not available.
Callback calls are slightly more expensive as there are two parts to each call. The app requires a very small amount of data to initiate the call.
Note: VAT is included in the displayed rates for all EU residents at their local VAT rate. Calls are charged in 60 second blocks and then rounded up to the nearest penny/cent.