Starting Saturday, Idaho residents will have to switch to 10-digit dialing to prepare for a new `986' area code coming in August.
The `208' area code -- Idaho's only one until now -- was introduced in 1947 and replaced a system where residents dialed a few letters and numbers to make a call.
The state is running out of numbers due to cellphone users and internet calling.
Idaho is one of a dozen states remaining with just one area code.
The Idaho Public Utilities Commission says the new area code will be assigned to new numbers and no existing numbers will change.
