The Lumia 950 and 950 XL both have microSD slots so you can have more room for storage. In fact, you can get a 200GB microSDXC card for the phones right now. These high-speed, high-capacity cards can get expensive depending on what you get, so making sure to take care of them can save you money later on. For example, simply pulling the microSD card out of your Lumia 950 or 950 XL isn't recommended. We'll show you the safer way.
Full story from the WindowsCentral blog...