The best way of getting through a phone convo to scam;
Find a number of a local fax machine.
Give them that phone number to call, but before you do it say "Our fax machine is hooked up right now, so I'm not too sure if it's going to go to the phone or not".
They'll message you back saying "I just heard a whole bunch of beeps and stuff" Say that it's your fax machine and you'll just call them.
Once they give you their phone number, use *67 to block your number before calling.
Most people won't care because they think they already have your phone number incase you'd scam them.
If they say anything about it, say that they already have your phone number and your phone autocalls under private and you don't know how to turn it off.
I use this all the time and works like magic.
If you need any help with it, PM or post here. =]
Made by bonesFX