Keep your Anti Virus program up to date. Not only do you need to keep your definitions up to date, you need to replace or upgrade your anti virus program too.
Making sure that your Antivirus is working is just good practice. Run a manual scan of your computer once a week just to make sure it is really working for you.
A Screen protector on your iPhone can save you hundreds of dollars in replacement costs. Also, Applecare for your iPhone will let you get a replacement for your phone for free.