I needed to do a factory reset on my new Vodafone 845 today. Either I forgot my swipe-lock pattern or the phone did. We haven't settled that argument yet. 

But to fix it you need to do a factory reset. To do that, you have to get into the phone's recovery menu. 

New thread to help this stand out in case anyone has an urgent need: 

To get to the stock recovery menu on the Vodafone 845, do the following: 

1. Power the phone off.  

2. Hold down 'Call' (left-most button) and 'Vol-Up'....and while holding them both, press Power and release Power...and continue to hold the other two for at least 3 more seconds. 

The phone will then boot into a recovery menu allowing you to perform a factory reset. 

You navigate in the recovery menu by swiping the optical sensor (centre button) up and down to move the cursor..and press the optical sensor to select an option.