The simplest way to check if your phone is nearby is to call it. There are online services that allow you to either make an actual phone call or simply make your cell phone ring. Either way, you can use these services to help you locate your cell phone in case you have no other means to call your phone. One service is WheresMyCellPhone.com.
If it is lost call your mobile provider immediately. They can help by turning it off.
If you have an iPad or iPhone the iCloud will be available in Fall 11. Apple should continue to offer location services.
For android devices here’s an article that describes the various services.
I use Prey on my android phone and MobileMe on my iPad.
These articles have some helpful hints about phones.
- Cell Phones – Some Good Info (curmilus.wordpress.com)
- My cell phone, My lifeline! (changingworldofwomen.wordpress.com)
- How to Locate Mobile Phone Location (freearticles4all.wordpress.com)