From Wikipedia, the free encyclopedia
Jump to: navigation, search

NITZ, or Network Identity and Time Zone,[1] is a mechanism for provisioning local time and date, time zone and DST offset, as well as network provider identity information, to mobile devices via a wireless network.[2] NITZ has been an optional part of the official GSM standard since phase 2+ release 96.[3] NITZ is often used to automatically update the system clock of mobile phones.

In terms of standards and other timing or network access protocols such as NTP or CDMA2000, the quality and enforcement of NITZ is weak. This standard allows the network to "transfer its current identity, universal time, DST and LTZ"[1] but each is optional, and support across RAN vendor and operator varies. This presents a problem for device manufacturers, who are required to maintain a complex timezone database, rather than rely on the network operator. Additionally, unlike 3GPP2, which transmits GPS-sourced, millisecond resolution time via the sync channel, for NITZ, the "accuracy of the time information is in the order of minutes.".[1]

Carriers supporting NITZ[edit]

NITZ is supported by many carriers around the world, including:[4]

Carriers not supporting NITZ[edit]

NITZ is not supported by some carriers around the world, including:[citation needed]


  1. ^ a b c 3GPP TSG SA WG1—Services (12 September 2012). "Network Identity and TimeZone (NITZ); Service description; Stage 1". 3rd Generation Partnership Project (3GPP). Release 11. 3GPP. Retrieved 27 November 2013. 
  2. ^
  3. ^
  4. ^[dead link]
  5. ^
  6. ^
  7. ^
  8. ^
  9. ^