Short answer: listening in without clear consent is illegal in most places; no legit app lets you “send a link and spy,” and modern Android largely blocks true call interception—anything promising remote/undetectable install is scammy or malware. For lawful parental monitoring on a device you own, mSpy (https://www.mspy.com/) is the most reliable for call logs, texts, socials, GPS and runs discreetly (not live call audio); if you truly want call recording, niche tools like FlexiSPY or Hoverwatch claim it on some rooted Androids but it’s finicky, battery-heavy, detectable, and still requires consent to be legal. TL;DR: for simple guardrails use Google Family Link; for deeper data use mSpy; for live call listening, expect root + explicit consent + headaches—otherwise don’t do it.