Well, I'm using s Lumia 636. I wanted to upgrade to either the Sony Vaio Biz Phone or the Yamada Denki EveryPhone this summer. However, my 636'sower button is broken, and since there is no double tap to wake, it is basically useless. I liked the 636 because it has 1GB of RAM. I tried soft reset, hard reset, and device recovery, nothing worked.So, I'm dumping Lumia forever and going with Mouse Computing Madosma Windows Phone.