Why the 630 Dual Sim? Primarily it was the dual SIM solution that I find well implemented. In all its activities, I can choose, on which card they are to be handled. Business: Have a company mobile phone and access to Exchange Server (Outlook). Connection and synchronization problems. Mail, Calendar, Tasks, Contacts; all there, everything relatively intuitive to use (for which Outlook or Outlook Web Access knows). Private: I am unpretentious, a bit Mail, Whatsapp, Google contacts are involved. Dates I care now only in the business calendar -> me this works great and I now have everything at a glance. Offline Naviagtion for lau: works well bought, for just 20 EUR inclusive package (all cards in the world with Naviagtionsplanung and announcement). As one can probably nothing wrong. What the cell phone can not (and I do not miss): no front camera. So good I do not look that I have to do Selfies of me constantly. No flash. To correct photograph I take a right camera. Screen resolution and illumination: No, I see me no overlong movies in 4K resolution on the phone. In this respect, the resolution is sufficient for me. The Lumia is a tool for me, it should support me. That makes it good, especially for the price. Data Protection: Just as you need an Apple Acoount for Android a Google -Account and for an iPhone, so you need (if you want to use Backup, etc.) a Microsoft account. So do not get upset :-). The weighting data I have not in the cloud (or encrypted). Apps: Yes, because there are not nearly as many as in the other worlds. And? Who needs the 100th image editing app is wrong here. But who really needs it?