I purchased an HTC One a few days ago, but didn't realize until it arrived that it needed a microsim. I ordered one from the site, and it arrived yesterday. I've now tried the swap my sim page 3 times, and the only thing that has happened is that the new sim has gone dead.
From what I understood, the old sim should go dead first, followed by the new sim, then the new sim should come back online with the number from the old sim.
I'm therefore slightly concerned that it's done the swap in the wrong direction and i'm going to lose my number (i'm sure I followed the directions correctly though: entered my number into the page, then entered the verification code I recieved by text. I was then asked for the serial number of the new sim, which I entered. Right after doing this, the new sim lost service.)
I've tried phoning both numbers from a landline, and my original number still rings on my old phone, but the new number comes up as not recognized, which makes me think it's in progress.
If I reboot the One, it comes up with 'preparing Sim card', followed by 'restricted access changed' which I understand means that voice or data services are blocked on that sim.
I would contact o2, except I don't have the time to phone at the moment, and live chat seems to be perpetually busy according to the support page. I also can't get to an o2 store (if i need to) until tuesday at the earliest.
