If I use my cell phone for business and personal, how do I input the expenses?

It depends on if you are a W-2 employee, a special exception or you have your own business.

• A W-2 employee can no longer claim any miscellaneous itemized deductions that are subject to the 2%-of-AGI limitation, including unreimbursed employee expenses.
• You can take a deduction if you fall into one of the following categories of employment, or have certain qualified educator expenses.
  • Armed Forces reservists.
  • Qualified performing artists.
  • Fee-basis state or local government officials.
  • Employees with impairment-related work expenses.
  • Unreimbursed employee expenses for individuals in these categories of employment are deducted as adjustments to gross income.
• If you own your own business you can take a business expense equal to the percentage of cell phone use.

Publication 529 Deductions for Unreimbursed Employee Expenses