First off I'm very new to this so some of my questions may be silly. I worked for several companies that issued me a T4A which means I need to fill out a T2125 with business expenses. To my understanding I can claim the portion of my cellphone bill related to work. I hadn't been keeping track of it and was wondering how can I estimate which portion was used for work, and in the event of an audit how would such a thing be proven?
What parts of using a smartphone even count?
Here is a hypothetical example to show what I mean: On an average week: 5 hours spent on work related phone calls 5 hours spent on personal phone calls. So from this would I claim 50% of the bill? What if I then spent 5 hours a week playing a game on my phone, then would the claim be 33.3%?
What about how I need Google Maps for work, or the phone's camera? How would I count the time reading text messages and emails on my phone?