It looks Micro in the picture but I'm no expert.
I'll give a warning that's been mentioned many times no doubt... Try to avoid using an adapter to change from micro to standard as it ripped the innards out of my N8 when I switched back from the Lumia 800.
I recommend contacting your supplier so that you're in the position to go back and forth as required. Vodafone were certainly happy with this for me, although they did initially ask for £5 or so postage, so popping to a store made this gratis.