You can use dictation even when you aren’t connected to the Internet. It’s a setting thats only availble for those rocking an iPhone 6s or iPhone 6s Plus.
Head to System Preferences -> General -> Keyboard.
Once enabled, you can do dictation in most text entry fields by tapping the microphone and speaking.
If you’ve one of the latest and greatest iPhones let us know how you get on in the comments below.