You can only deduct the expenses which were incurred while doing business. So in your case, you can only deduct the phone bill when you started self-employment. However, even after you started self-employment you can only deduct the portion of cell phone bill which was used for business purposes. For example, if you used your cell phone for 40% for business purposes and 60% for personal purpose, then you can only deduct 40% of your phone bill as a business expense and the rest 60% cannot be deducted since its a personal expense.
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