address, billing information if applicable, etc.). Which information an ISP collects, what it does with that information, and whether it informs its consumers, pose significant privacy issues. Beyond the usage of collected information typical of third parties, ISPs sometimes state that they will make their information available to government authorities upon request. In the US and other countries, such a request does not necessarily require a warrant. An ISP cannot know the contents of properly encrypted data passing between its consumers and the internet. For encrypting web traffic, https has become the most popular and best-supported standard. Even if users encrypt the data, the ISP still knows the IP addresses of the sender and of the recipient. (However, see the IP addresses section for workarounds.) An Anonymizer such as I2P – The Anonymous Network or Tor can be used for accessing web services without them knowing one's IP address and without one's ISP knowing what the services are that one accesses. Additional software has been developed that may provide more secure and anonymous alternatives to other applications. For example, Bitmessage can be used as an alternative for email and Cryptocat as an alternative for online chat. On the other hand, in addition to End-to-End encryption software, there are web services such as Qlink which provide privacy through a novel security protocol which does not require installing any software. While signing up for internet services, each computer contains a unique IP, Internet Protocol address. This particular address will not give away private or personal information, however, a weak link could potentially reveal information from one's ISP. General concerns regarding internet user privacy have become enough of a concern for a UN agency to issue a report on the dangers of identity fraud. In 2007, the Council of Europe held its first annual Data Protection Day on January 28, which has since evolved into the annual Data Privacy Day. T-Mobile USA does not store any information on web browsing. Verizon Wireless keeps a record of the websites a subscriber visits for up to a year. Virgin Mobile keeps text messages for three months. Verizon keeps text messages for three to five days. None of the other carriers keep texts of messages at all, but they keep a record of who texted who for over a year. AT&T Mobility keeps for five to seven years a record of who text messages who and