You can hide your phone number and caller id for one call only!
Pick a contact or enter a phone number.
Set your prefix code based on your location(country). The code will be generated. If it contains # or * only a dummy number will be called. After the dummy call ends, you can paste the code in the dialer!
If the generated number does not contain special characters, it will be called immediately. (like in UK). See prefix codes on home page. Default settings are for United Kingdom (141).
Other codes (if you cant find your country, try generic):
USA #67
Generic GSM #31#
UK 141
Germany *31#
Hungary #31#
Australia 1831
New Zeeland,Telecom 0197
Israel *31
Hong Kong 131
Denmark *31*