Can I use an sd card for an iphone 5c?

Yes they do. Am currently trying to locate the 5c's one. I'll post a reply when I find it for you. I just upgrade my 5s from 16g to 128g. The difference is amazing. I can actually take a picture now.

An iPhone has no capability to use an SD card.

No, they don't have an SD slot.

No iPhone model - the iPhone 5c included - has an SD card slot.

If you have inserted an SD card into a 5s (for example) to upgrade the memory, then you do not have a genuine iPhone.

No, they don't.

<Edited by Host>

Al iPhone 5c se le puede adaptar una micro sd de 16 Gb?

No.