There aren't any specific apps in particular that we recommend, however, there is the Voice Memo app already on your phone you can record on. It can record multiple conversations and you can always name them as a reference to go back and listen.

https://membership.joshphegan.com.au/lesson/members-qa-session-12th-august-2016/

*Note: this records only your conversation (one-sided), you must get permission to record the customer if using an app/phone to record their answers.

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