Your phone does not have a micro-SD card slot, but it provides the onboard storage as below:
- 4GB (Lumia 505 and 510)
- 8GB (Lumia 610 and 710)
- 16GB (Lumia 800, 900, and 925)
- 32GB (Lumia 920, 920T, 928 and 1020)
You may also have Microsoft OneDrive cloud storage, which lets you access and share docs and photos virtually anywhere.
More information about OneDrive can be found at https://onedrive.live.com