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Mobile phone spam
Mobile phone spam is a form of spam directed at the text messaging or other communications services of mobile phones. It is described as mobile spamming, SMS spam, text spam, m-spam or mspam. As the popularity of mobile phones surged in the early 2000s, frequent users of text messaging began to see an increase in the number of unsolicited (and generally unwanted) commercial advertisements being sent to their telephones through text messaging. This can be particularly annoying for the recipient because, unlike in email, some recipients may be charged a fee for every message received, including spam.
Mobile phone spam is generally less pervasive than email spam, where in 2010 around 90% of email is spam. The amount of mobile spam varies widely from region to region. In North America, mobile spam has steadily increased from 2008 ed 2012, but remains below 1% as of December 2012. In parts of Asia up to 30% of messages were spam in 2012.
The lesser and geographically uneven prevalence of mobile phone spam is attributable to geographic variation of prevalence of mobile vs non-mobile electronic communications, the higher cost (to spammers) of and technological barriers to sending mobile messages in some areas, and to law enforcement in others. Today, particularly in North America, most mobile phone spam is sent from mobile devices that have prepaid unlimited messaging rate plans. While the rate plans allow for unlimited messaging, in reality the relatively slow sending rate (on the order of magnitude of 1/s) limits the number of messages that may be sent before an abusing mobile is shut down.
== Criminality and law enforcement ==
SMS spam is illegal under common law in many jurisdictions as trespass to chattels.〔Compuserve v Cyberpromo〕 Jurisdictions with specific SMS spam regulation and fines include Australia, the EU, and the United States. In the US, violators face substantial costs. For example, in a 2008 settlement, the violator agreed to pay $150 to each spam recipient. In a 2010 class action settlement of Satterfield v. Simon & Schuster, a case that reached the US Ninth Circuit Court of Appeals, defendants agreed to pay $175 to each spam recipient.〔http://en.wikipedia.org/w/index.php?title=Ringtone&oldid=407551078#Satterfield_v._Simon_.26_Schuster〕 In subsequent cases, the payment per class member has increased to $200 in 2011 and $500 in 2013.〔Lozano v. Twentieth Century Fox (N.D. Ill. 2011)〕〔Pimental v. Google (N.D. Cal 2011; Case No. 11-cv-02585-YGR)〕 In response to Satterfield, entities who make money sending mobile phone spam formed the Mobile Advocacy Coalition (MAC) to lobby the government to legalize that activity.〔https://digital.lib.washington.edu/dspace-law/handle/1773.1/450 Mobile Marketing Derailed, pg. 42 (PDF pg. 10)〕 In the US, the Federal Trade Commission (FTC) has expanded Phone Spam regulations to cover also Voice Spam—mostly in form of prerecorded telemarketing calls—commonly known as robocalls; victims can file a complaint with the FCC. In California, Section 17538.41 of the B&P Code bans text message advertisement. Consumers can sue on an individual or class basis per a private right of action against unfair business practices.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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