The biggest cell phone scam is known as subscriber fraud which is simply identity theft. This type of fraud causes the industry approximately $150M/year and causing a lot trouble to the victims.
How? Someone opens a cell phone account in your name after stealing your personal information. This phone account, unknown to the victim brings incredible telephone bills.
What to do? Protect yourself against identity theft. More information about this fraud and what to do can be found in the Identity Theft Information Center.
Every year, around 3M cell phones are either stolen or lost in the US. These phones can be used to make unauthorized calls and it may cause the owner for example, $26K bill.
Most of the smart phones carry a lot of personal information on them, including information of the people we care most. An alternative way to give damage to someone is information mining. Someone can learn lots of information and steal many more identities through a smart phone.
What to do? Consider your cell phone like you wallet and look after it in your best way. You can use password protection for all the possible personal information storage. See the article on cell phone theft and passwords.
How? There certain type of scanners to read your cell phone identity, including the unique serial number. Then, crooks program another phone with your personal information details as well as your cell phones unique details and make calls at your expense.
What to do? Some good people, whom are known to be good fighters, use new technology which makes it more difficult to scan for number. In addition, you can keep close eye on your phone bill and disclaim any calls which do not belong to you.