Surveillance expert Julia Adams offers the different ways to secretly record a conversation in this how-to video.
Recording your phone conversations
This can be done using a digital recorder and a lead to your phone. The type of lead will depend on the type of phone you are using. Use a mobile record lead for a mobile phone, a multi-line record lead for an office phone or a domestic phone line recorder if you want to record home phone calls.
Recording other people's phone conversations
It's illegal to record both sides of a mobile phone call, although you can use a UHF phone transmitter to record landline conversations, providing you're not in the EU.
Recording your face-to-face conversations
Miniature video cameras can be hidden on your person - in a button hole, or in the lid of a pen for example.
Recording other people's face-to-face conversations
If you know the location of the conversation, a GSM transmitter can be hidden in an item of furniture in the room, for example a table lamp. Or you can plant an ultra slim transmitter on the person you would like to record if you don't know where the conversation is going to take place.
Watch this video tutorial and learn how to secretly record conversations.