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Across iOS and Android, the same baseline applies: codesigning enforced (Play Integrity / iOS sandbox), keychain-backed secrets, certificate pinning, no debugging in release builds, encrypted local storage, biometric gating for sensitive actions, root/jailbreak detection (signal, not gate), and an MDM strategy for enterprise distribution.
Production checklist: (1) all secrets in Keychain/Keystore; (2) TLS pinning; (3) ProGuard/R8 + iOS bitcode obfuscation; (4) Play Integrity / DeviceCheck for backend; (5) biometric for sensitive flows; (6) no logs of PII; (7) re-encrypt-on-reboot via Secure Enclave / StrongBox; (8) MDM-friendly entitlements / manifest.