Avast Cleanup and Boost, Phone Cleaner, Optimizer6.5.3

Protect yourself against viruses and malware that cause popups and unwanted ads with Avast Mobile Security, the worlds most trusted free antivirus app for Android. Get alerted when you install spyware and adware apps that violate your privacy. Secure your devices against phishing attacks from email, phone calls, infected websites or SMS messages.

With more than 100 million installs, Mobile Security - Antivirus provides much more than just antivirus. Heres a sample of some of the other features packed into this lightweight app:
Antivirus Engine
WiFi Speed Test And more amazing features to protect and improve your Android experience What's NEW?
Photo Vault allows you to protect access to your photos with a PIN code. After moving photos to the Vault, they are encrypted and hidden.
Power Save reduces your device's battery consumption by adjusting set of settings such as the Wi-Fi, synchronization, Bluetooth and screen settings that drain your battery the most. We are now offering premium features: Anti-Theft: Automatically lock your device on SIM change, and secretly capture photos and audio recording of the thief.
AppLock: retain security and privacy of sensitive content by locking any app with a PIN or touch gesture. Protect your most used apps and make sure nobody else can access them not your child or even an intruder.
Remove ads: eliminate ads from your Avast Antivirus experience.
Avast Direct Support: contact Avast directly from the app to receive quick responses to your inquiries. Avast Mobile Security in detail Antivirus Engine: Virus and malware scanner automatically scans for infected/dangerous apps and Trojans upon first use. Includes Web - file scanning for complete mobile protection, and also protects against spyware and viruses.
Clean Junk: Instantly cleans up unnecessary data, system caches, gallery thumbnails, installation files, and residual files.
Call Blocker: eep your privacy. Add phone numbers to your blacklist and block callers you dont want contacting you.
Web Shield: Scans and blocks malware-infected links, as well as trojans, adware, and spyware (for privacy and safe Web browsing, e.g. Chrome) and also fixes mistyped URLs.
Wifi Security: Check the security of each network and email, browse and make payments wherever you are. This app uses the Device Administrator permission. This permission allows you to remotely lock and wipe your device from my.avast.com.