Washington Utilities and Transportation Commission
Slamming occurs when your phone service, either local or long-distance, is switched to another company without your consent. This practice is illegal but not uncommon.
Consumers may change telephone companies by calling the company of their choice and asking for a change or by agreeing to switch during a telemarketing call. The new company is required to verify the switch in any one of the following ways:
Each month, inspect your phone bill for any irregularities, particularly for any charges from companies you do not recognize or normally see on your bill. If you notice a new provider on your bill that you did not authorize, then you may have been slammed.
You can check your assigned carrier by calling toll-free:
A recording will tell you the name of your provider.