As the use of smart phones and tablets keeps growing, the need to protect your information does, too.
Most mobile devices run on Android systems, so Consumer Reports tested 16 apps designed to keep Android devices safe.
"These apps protect you against online threats like viruses and malware, and they also help you, if your phone is lost or stolen, to remotely lock it or find it or wipe it,"
Consumer Reports' Dean Gallea said.
Testers checked to see how well each app protects a user's privacy and assessed extras like parental controls and the ability to back up your phone.
Some of the apps cost $40. Consumer Reports found some of the lower-rated ones were the more expensive ones, and one of the best is free.
It's the Avast! Mobile Security and Antivirus app.
The other top-rated apps are McAfee Antivirus and Security for $30 a year and BitDefender Mobile Security and Antivirus for $10 a year.
iPhones are less susceptible to viruses because Apple's store is the only source for apps.
However, no phone is immune to theft.
If you have an iPhone, the "Find my iPhone" feature can help you locate your phone on a map or remotely lock or delete all data.