Backing up the iPhone's SMS!
The iPhone has an SMS limit of 1000 SMS even though you have a lot of space remaining. You might want to backup these SMS before erasing them though. What is great is that SMS are automatically synched by iTunes. Applications like MobileSyncBrowser (donationware) and Syphone (free from Micromat) can do this quite easily. I was somewhat disappointed by both, but they are still useful and they can get the job done. The free Syphone doesn't support well accented characters and it didn't recognize my iPhone at first. I finally checked the support forum and resolved the issue by synching the iPhone with "Run helper app in the background" and unchecking it after to make the SMS appear. A problem that I found on both apps is that incoming and outgoing texts are separate. Both apps are still useful and I think if you can get Syphone to work, it is a great option because it is free.