My circumstance (A): "Smart" mobile phone purchased out-right & an unlimited SIM only contract.
A N Other's circumstance (B): "Smart" mobile phone all inclusive contract which includes a sum in monthly charges for the phone provided under the contract.
I chose to claim WDA on the phone (rather than AIA) based on an assessed percentage use for a combination of biz calls, voice memos, calendar, web searches etc etc. However, I do not claim for any percentage of the monthly SIM charge (unless I have actually incurred an identifiable out-of-contract cost for a biz purpose). I believe that is acceptable, but can someone under circumstance (B) claim anything similar given that they are actually paying for their phone in instalments via their monthly all inclusive contract charge?
If they can, would it be acceptable to compare the price of their contract with the price of a SIM only contract in order to establish the monthly amount they are nominally paying for the actual phone - in other words, the difference between contract prices would be the cost of buying the phone in installments?