How to upgrade my iphone 6 memory?

Its 16gb… Any way of doing that? Even if i get a portable drive it won't sync everything! Any ideassss?

It is not safe to upgrade your iPhone memory. But you can do something to save iPhone space.
1) Delete Apps you don't need
2) Find out which Apps are taking up the most space
3) Turn off Photo Stream and Only save HDR photos
4) Set Messages to auto-delete
5) Delete voicemail messages
6) Use iMyfone Space Saver for iPhone to easily free up iPhone space by junk files clean-up and photo compression.

You can't upgrade it as iPhone dose not have expandable memory slot and also it only have internal memory and also try Leo Privacy Guard in order to get utmost security on your device.

Can you upgrade iphone 6s memory?