Is there any way I could recover this?

I have a iphone 4S and in my notes I had a really important note and I accidentely deleted it. Is there any way I can get it back?

Maybe, try recovering your phone through itunes. Thats only if you had previously backed up your iphone. If not then i don't think there's another way. Sorry

Those deleted notes are still stored in iPhone Database. So you have two ways to recover them.
If you have synced or backed up with iTunes, just recover from iTunes backup. But some files on iPhone have not been backed up will be lost.
Another way is recover them from iPhone Database. Some 3rd party iPhone Recovery tool can recover them. Such as http://www.datarecoveryforiphone.com/ios-data-recovery.html.

If it works, can you give me the best answer?