You may not realize it, but your smartphone is probably the most important piece of technology that you own. Your whole life's in there. Online banking, getting directions, making payments, private text, personal photos and calls. That's why you have to make it as secure as possible. And one of the ways to do that is to make sure that you aren't using an outdated phone. A good rule of thumb is three years. If your phone is over three years old, chances are it's no longer getting security updates from the manufacturer. Also, be sure to apply the updates when they become available for your smartphone. Buy a new phone before your current phone is no longer supported by the manufacturer and make sure that you are not giving your old phones to your kids, parents and other family members. One last thing Make sure that you completely wipe your phone before donating or recycling it. And here's how. Back up your data. That's a given. Remove the SIM card and any other memory cards that may be on the phone. Remove your accounts, perform a factory reset.