I’ve always found that most apps for monitoring calls require installation directly on the target phone—there’s no way to do this remotely. Popular options include mSpy and FlexiSPY, which record phone calls and upload them to a dashboard. Usually, these apps run quietly in the background, but a savvy user might spot them if they know what to look for. What worked for me was making sure the app was set to “stealth mode” for minimal detection.