How do I account for the unlimited plan cost of my cell phone bill for self-employed home office use?

I use my cell phone 90% of the time for self-employed home business use. I'm trying to figure out how to calculate the deduct-able amount for "the wireless plan" ie Unlimited data, calling and texts. I do share the wireless plan with one other person so I was thinking I could divide the plan cost in half and then account for 90% of my half.

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This is not an exact science, but your idea sounds like a reasonable calculation. I would say it's extremely reasonable if it's your only business phone number. Make sure you keep documentation of phone bills and notes on your calculation method for documentation purposes.