Canon RP-108 consists of 2 rolls (2x 54 images) and Canon KP-108IN consists of 3 rolls(3x 36 images). KP-108 is more photo paper and RP108 is more postcard paper. RP108 partly does not work on older machines.

The photo paper is divided into three packages. One pack fits into the "loading drawer", which can be removed and closed for transport. You also get 3 colour cartridges, these should be changed together with the paper. So the answers to your questions would be: Yes, 36 photos.

I have the CP1300 and it works there. Google-Suche: https://store.canon.ch/canon-rp-108-farbtinte-100-x-148-mm-papier-108-blatt/8568B001/

Yes (noted on the CP1300 packaging)

Fits my CP1300

Yes, the pack contains the paper and ink cartridges.

I don't know, I just bought it... ask directly at canon

https://www.digitec.ch/de/tag/showdiscussion/falsche-preise-19655

Yes, you can do that with the cp 1300.

You can return these like normal ink cartridges to a specialist retailer, e.g. Digitec or Migros customer service. Wherever normal ink cartridges are accepted, these should also be accepted.

I have the CP 1300, but I think paper should also work on the 1250, as long as the size is the same.

Yes it is compatible

The paper is postcard-like. The print quality together with the Canon CP-1300 is also about postcard quality.

Unfortunately, I cannot answer this question because I use the CP1300.

Yes, it works with the iPhone. You can download the Canon PRINT application. In my case, the printer doesn't see my wifi modem so I set the printer as a wifi modem and connect my iPhone to it. From then on, it works very well.