Looks like you're with UNKNOWN.(Not with UNKNOWN?)
Since your first WHYPAY? conference call, we calculate you've saved
WHYPAY? is completely free to use and calls to our 03 number are also FREE as long as you have bundled minutes available (this applies to UK landline and mobile networks). If you don't have inclusive minutes available, your call must be charged the same as a call to an 01 or 02 number by your network.
Other conference services are not free to call. They'll charge you an average of 33 pence per minute from a UNKNOWN phone, giving the estimated savings above.