How do you change your relationship status on Facebook on an iPhone?

First you will need to be logged in - (Trick answer). On most mobile phones you can either view from the Mobile site or the Full Site (Full site is the only option to change/edit your information). Once you are logged into the full site, you will need to view your profile. Once your page has uploaded (if you are using the new fb layout) you will click the info button to the left of the page. At the bottom of the info page there you will find basic info and the option to edit your status, name, work, education etc.

So if you are single ----- spell it out! Hope this helps...