Re: years ago, there was a growing market for cheap overseas phone calls.
It's a jungle if you just need odd calls and don't want to open an account with a VOIP provider. But at 30p+/min it doesn't take long to burn through more than the minimum topup on somewhere reliable and cheap, with local rate access numbers if you can't SIP.
Thanks to phone phobia we find it massively cheaper throwing a couple of £ at Localphone each year than having bundled landline or mobile voice minutes even for local calls.