Save your photos and videos to a memory card
If there is a memory card in your phone, and your phone memory is filling up, save the photos you take and videos you record to the memory card.
Before recording videos to the memory card, make sure you use a fast enough microSD card. For 360p and 720p videos, use a microSD card, class 4 or higher. For full HD (1080p) videos, use at least a class 6 card.
On the start screen, swipe left, and tap Settings > phone storage .
Switch Store new pictures on to SD card .