Can other Unis look at my application while I hold a place?

I hold an unconditional place at a uni that I am unsure of attending, and as clearing opens tomorrow I’d like to look around at other options. If I give my UCAS number over the phone to other institutions, will they still be able to view my application in full? Thank you

Hi, thank you this is very helpful. I’ve found that already some unis that I’ve contacted already are quite open to letting me know whether they’d take me or not which is certainly taking off a bit of pressure. I do already have my grades tho which probably helps