电信诈骗（简称“电诈”），是指通过使用与电话相关的电信产品或服务获取金钱的非法方式。
Phone fraud, or more generally communications fraud, is the use of telecommunications products or services with the intention of illegally acquiring money from, or failing to pay, a telecommunication company or its customers.
电信诈骗是以通过电话、短信以及互联网联系作为主要手段的诈骗案件，主要意在获取被害人的财产或者身份证、银行账户等隐私信息。
许多运营商都已采取措施，尽量减少欺诈并降低损失。通信运营商倾向于对其实际损失数字和纠正措施计划保密。
根据 CFCA（一个旨在减少针对运营商的欺诈行为的行业组织）在 2011 年进行的一项调查，运营商报告的五大欺诈损失类别是：
49.6 亿美元 – PBX/语音邮件系统被盗
43.2 亿美元 – 订阅/身份盗窃
38.4 亿美元 – 国际收入分成欺诈
28.8 亿美元 – 旁路欺诈
24 亿美元 – 现金欺诈
Telecommunications fraud is a fraud case that uses telephone, text messages and the Internet as the main means of communication, and its main purpose is to obtain the victim’s property or private information such as identity card, bank account, etc.
Many operators have increased measures to minimize fraud and reduce their losses. Communications operators tend to keep their actual loss figures and plans for corrective measures confidential.
According to a 2011 survey by CFCA, an industry group created to reduce fraud against carriers, the five top fraud loss categories reported by operators were:
$4.96 billion – compromised PBX/voicemail systems
$4.32 billion – subscription/identity theft
$3.84 billion – International Revenue Share Fraud
$2.88 billion – by-pass fraud
$2.40 billion – cash fraud