It's always a good idea to protect your login information on an Android device and the best way to do that is by using 2 factor authentication. Two factor authentication is also known as dual factor authentication, and it will use any 2 of 3 pieces of information to establish your identity.
One of the identity authentication methods will consist of either a password or personal identification number (PIN) or the answer to a security question. It is based on something you know.
The second authentication method will be based on something you possess. It may be a smart card or ID badge, a USB key, or a one-time password device which may be used to set a browser or application cookie.
The third possibility is usually something unique to your person such as a fingerprint or other biometric data. Sometimes this will also be done through phone verification. Voice or phone verification may fall under the heading biometric data or it may be something you possess, based on caller ID or a PIN sent by SMS text message.
There is identity verification software available that will make two factor authentication easier to implement. These will usually include managing the creation of a one time use password which gets sent to the user by e-mail or text message. There is usually a cutoff time during which the password is valid such as 30 or 60 minutes.
These software tools can be important not only for protecting your smart phone login, but they're also important for many things we do online such as shopping and online banking. They also make it easier to stay in compliance with various regulations related to security and privacy since they make it their job to stay on top of the various changes as they happen, whether it be in the U.S. or anywhere around the globe.