Is iso 80 on iphone same as iso on canon dslr?

Is iso 80 on iphone same as iso on canon dslr?
this is for comparison of grain, noise i get on photos.iso 80 is quite low, i would expect higer iso on the photo of sun set i took.i'm not sure if same iso would be if i used canon dslr. But the question is will iso on iphone camera be same iso as on canon dslr to illuminate the same schine/photo with the same brightness.

Added (1). Ps, i hate photo noise, grain. I like smooth images.

ISO is an international standard - the same everywhere in the free world.

ISO sensor sensitivity is what it is, no matter what cameras you use

The iso is the same… That's about it, you mention that you hate noise, grain and like smooth images, you really should invest in a dedicated camera… The DSLR image will always be much more superior than your iPhone image (the iPhone has a very 'tiny' sensor) you really should think about even upgrading from the iPhone to at the very least a 'compact' camera for more acceptable images… If you just use the iPhone camera for quick 'snaps' and are happy with what you get then that's fine… Just don't expect an iPhone to be anywhere near as good as any 'dedicated' camera when it comes to image quality… An iPhone is a phone first… The camera in it was an 'afterthought'.

ISO is the sensitivity of the sensor. It does not change when you point the camera at different objects. However, the camera may be set to auto ISO and change the ISO to a different value (sensitivity) when this happens, but a given ISO such as 80 is going to be the same sensitivity value from one camera to the next.

Now, ISO 80 on a iphone may look quite different than ISO 80 on a DSLR. The reason is the iPhone has a sensor 100 times smaller than a DSLR so it's performance characteristics may not be the same. Even at the same ISO, the quality may be different.

ISO only relates to the sensor's sensitivity to light, not it's overall quality.

However, for any given camera, lower ISOs produce better photos (less noise, better color, etc).

Here is an analogy:

Say you have an AM radio. The ISO is somewhat analogous to the volume control. If you are listening to a close by radio station, you get a strong and clean signal at a relatively low volume level. This would be like a low ISO sensitivity. With a strong signal (or light in the case of the camera), not much volume is needed.

However, say you tune in to a distant radio station with a weak signal (analogous to low light). You may have to turn up the volume to hear it, and when you do, not only the radio station becomes louder, but all of the background noise is louder as well. Turning up the volume in this sense is like increasing the ISO sensitivity, which amplifies the signal to a useable level, but also amplifies the background noise as well. And the signal itself, being weak, is probably going to have marginal quality.

So, in the same way a higher volume in your radio increases a weak signal, a higher ISO increases a weak light source, both of which results in more noise and marginal quality.

What you are asking is similar to film in it's "hay" day. It was fact that the larger the negative the better the quality.technology brought about really great quality from the tiny (about 1 1/2 inch) 35mm negative when compared to a 4x5 inch negative use by press (newspaper) photographers.
ENTER DIGITAL, consider the camera's sensor as the "film" of your digital camera. The same axiom applies the larger the sensor the better the quality of the picture produced. So Digital Single Lens Reflex cameras with their largest of the sensors in digital cameras produce the best quality images. The sensor of iphone or any other brand phone is very tiny so naturally you can't expect much quality. Especially if you were to make enlargements. Phone cameras, compete with 4x6 quality on many cameras. But the sad fact is that the 4x6 print done by most neighborhood processors are inferior. That is just the nature of the beast. Consider when I was paying 3 cents for a postage stamp, the cost of a color print was 29 cents! TODAY that cost has been reduced to 13-to 20 cents, per print, depending where you go. So it is all relative. But many people swear their "box type camera" in digital is the BEST since french toast was invented! How sad…

Result you can get very smooth results on bridge type cameras, but the quality DSLR like Canon, Nikon and Pentax will out shine them a hundred to one if you make a decent size print! Use a low ISO, fill the frame and set the camera for maximu pixel useage and you will immediately see the difference!