Hi. I've been waiting for the pre-orders to open for but when they did, the option for the 512GB version just says it's out of stock and there's no option to add it to my basket. Does this mean that there has been a limited quantity ordered by o2 and they've all been pre-ordered already? If so, are o2 likely to get more in? I really want the 512GB version and was impressed that o2 actually had them listed for a change (I usually have to upgrade through carphone warehouse to get 512gb versions of phones). Does anyone have any insight into this, please? Thanks