"Slamming and cramming" - "Slamming" happens when a phone company illegally switches your phone service without your permission. "Cramming" occurs when companies add charges to your phone bill without your permission. "Bill shock" - A sudden and unexpected increase in monthly wireless bills that is not caused by a change in service plans.  False or misleading advertisements - You may have purchased an "unlimited" mobile plan from your phone company, but didn't get what you paid for.  http://www.usa.gov/phone-tv-complaints.