South Dakota's Department of Revenue says the state's emergency service tax on phone service will be changing.
The agency says it's doing an information campaign to tell phone and wireless companies about the changes.
For individual phone service lines, the charge is going up to $1.25 per month, starting July 1. The charge affects all cell phone and land line numbers.
South Dakotans who use prepaid cell phone service will have to pay a 2 percent charge on their service amount. For example, someone who buys $100 worth of service will owe a $2 tax.
The Revenue Department says companies that provide prepaid cell phone service must collect the tax and turn it in to the revenue agency.