There is a free version of Facebook for iPhone and it's not the cute baby pictures you're probably thinking of. There's actually a free service called Facebook for iPhone, but it's limited and doesn't allow you to use the application as much as if you paid. This application allows you to receive text messages from your friends and keep up with them even if you are away from your phone. You can have your messages sent directly to your phone and they will all be there when you return.
To find the free Facebook for iPhone, you can search on Google or simply go to Facebook.com/iphone and then click on the link for the app to the right side of the screen. This is the free version, but you can upgrade it by buying an in-app item. It's quite an upgrade, because you have more options available, such as sending and receiving SMS text messages to your phone instead of emails. This feature works great if you're always out of the office and just want to get some news straight to your inbox.
You can find the same software for Android as well. The problem with this is that the free Android App can't be used for sending and receiving SMS messages. If you want to use the same software on your phone, you'll need to buy an upgrade. The download is free and there are other apps for phones that use this type of technology. It's a good idea to install one or two different applications so that you can use your phone more effectively. These apps are sometimes free, but the developers will ask you to purchase an upgrade, so check your mail before you buy anything.