Sales tax is not included in the price, so if you buy the $399 phone, the sales tax is added on top of $399. The amount depends on state and city laws. Usually

Sales tax is not included in the price, so if you buy the $399 phone, the sales tax is added on top of $399. The amount depends on state and city laws. Usually about 7.75%, so the $399 phone would cost about 430 total.