How much of my cell phone can I write off on my taxes?

None of it, since AT&T does not separately bill long distance calls on any of their current rate plans.

If you have a SECOND cell phone and plan used solely for business use, you *might* be able to deduct that as a 2% miscellaneous itemized deduction. But on your first phone and line, only separately billed long distance business calls are deductible.

The employer element would be claimed on a 2106. The 2106 is extra on your time table A (after 2% of your AGI is deducted). Then in case you itemize, you may even see a distinction on your tax bill.

no, it is just like your land line in your home, you have to have a separate one for your business, you cannot determine that any % is attributable to the business, you have no way of proving

if your employer requires you to have a cell phone, you would need to get one just for that occupation

IRS doesn't accept "about" as a valid charge

Unless you can itemize you cannot deduct anything.

Claim half for work.