Bob clicked on a link in an email, and now he's having issues with his phone freezing up. He pulled the battery and replaced it, and now it works OK. Was it malware? Leo says probably not. These days malware doesn't want to get noticed. It works quietly in the background.
Bob can restore his phone to the factory default. That will wipe the phone and then reload the OS. Then he can log back into his Google account and re-download all of his apps and data. He can backup everything by going to Settings > Backup and Reset > Activate Backup. Once it's backed up. Then he can reset it.
Photo Credit: Sylvain Naudin via Flickr