At major operator Singtel in Singapore, Lumia 820 is really in demand. We have been tracking the performance of Lumia 920 / 820 around the world and reporting it more than anyone. While in other markets it is mostly all about Lumia 920 busting the best sellers charts. At least at Singtel, Lumia 820 has been in the top-selling phones list quite often and we have reported that before as well. The bad part here is that Lumia 920 still remains “out of stock” after Singtel sold out of first stock. Hope, the stock replenishment happens soon and we could have two top-selling Lumia phones at Singtel .