(1) Any code city which imposes a license fee or tax upon the business activity of engaging in the telephone business which is measured by gross receipts or gross income may impose the fee or tax, if it desires, on one hundred percent of the total gross revenue derived from intrastate toll telephone services subject to the fee or tax: PROVIDED, That the city shall not impose the fee or tax on that portion of network telephone service which represents charges to another telecommunications company, as defined in RCW
80.04.010, for connecting fees, switching charges, or carrier access charges relating to intrastate toll telephone services, or for access to, or charges for, interstate services, or charges for network telephone service that is purchased for the purpose of resale, or charges for mobile telecommunications services provided to customers whose place of primary use is not within the city.