This video will show you on how to install Call Record on your iPhone even iOS6 or iOS7. You just install one tweak called Call Recorder “source: insanelyi”. Your iDevice must be jailbreak devices in order to install this tweak.

*Instruction
Go to Cydia – Search – Type the word “Call Recorder in search box
– Choose it and Install – Respring – Done

Note: It supports only iPhone 4s and above. But iPhone 4s, you must turn on speaker to active report.