I have read that desktop programs may be used on 2 devices but does the mobile version count as one of those or can I use it on all 3 with the photography CC subscription?
The mobile versions do not count against your number of devices. I am currently running LR on a MAC, an iPhone and an iPad With no problems.
Note that you can also install CC on more than two computers, but you can only have two machines signed in to CC at the same time. To run on a 3rd machine, you would have to sign off on one of the other two machines.
hope this helps.
Thats great thank you.