My dad has a invoice problem with a client, unfortunately the client doesn't want to pay the amount of 1 year of work my dad has done for him. Now he's not happy and i was wondering if i could find an app which can record the voice of his client, when he's on phone with him, in order to have a proof... i fund a lot of apps but on the 3 i've tested, the 3 don't record the voice of the interlocutor. Could you help me please ? thanks

He has a Samsung (not the last version)

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