NITZ

Network Identity and Time Zone (NITZ)[1] is a mechanism for provisioning local time and date, time zone and daylight saving time (DST) offset, as well as network provider identity information, to mobile devices via a wireless network.[2]

History

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 time zone 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] The optional nature of the delivery mechanism results in issues for users in regions that don't practice daylight saving but which share a time zone with a region that does. Most modern handsets have their own internal time zone software and will automatically perform a daylight saving advance. Because the NITZ delivery is not usually periodic but dependent on the handset crossing radio network boundaries, these handsets can be displaying incorrect time for many hours or even days before a NITZ update arrives and corrects them.

Carriers supporting NITZ

Initial list derived from ref:[4]

Country Carrier NITZ available since Notes
 AustraliaOptusY
 AustraliaTelstraY
 AustraliaThreeY
 AzerbaijanNar2014
 CanadaRogersY
 CanadaSaskTelY
 ChinaChina MobileY
Croatia A1 Y
 Czech RepublicTelefónica O2Y
 Czech RepublicT-MobileY
 Czech RepublicVodafoneY
 FranceBouygues TelecomY
 FranceFreeY
 FranceOrangeY
 FranceSFR
 FinlandDNAY
 FinlandSoneraY (pre-2000)
 GermanyTelefónica O22009ref[5][6]
 Hong KongPCCWY
 Hong KongSmarToneY
 HungaryT-MobileY
 ItalyWindY
 MalaysiaU MobileY
 MexicoTelcelY
 NetherlandsKPNY
 NetherlandsVodafoneY
 New Zealand2degreesY
 New ZealandSpark New ZealandY
 New ZealandVodafoneY
 NigeriaMTNY
 PolandT-MobileY2G and 3G
 PolandP4 PlayY3G only
 PolandPlus (telecommunications Poland)Y2G and 3G
 PolandAero2Y2G and 3G
 RomaniaZappY
 RomaniaSaltY3G only
 RussiaMTSY
 SwedenTeliaY
 SwedenTelenorY
  SwitzerlandSunriseY
  SwitzerlandSwisscomY
  SwitzerlandSaltY
 TurkeyTurkcellY
 TurkeyVodafoneY
 TaiwanChunghwa TelecomY
 United KingdomTelefónica O2Y
 United KingdomVodafoneYref[7]
 USAAT&TY
 USAT-MobileY
 Norway<ALL>-
 TurkeyTürk Telekom-ref[8]
 AustraliaVodafone-
 ChinaChina Unicom-
 PolandPlus-
 GermanyTelekom-
 GermanyVodafone-
 JapanSoftBank-
 BelgiumMobistar-
 BelgiumProximus-
 MexicoMovistar-
 NetherlandsT-Mobile-
 SwedenTele2-
 Sweden3-
 United KingdomEE (telecommunications company)-
 IndiaBSNL-

References
  1. 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. "Network Identity and Timezone (Nitz) Functionality for Non-3gpp Devices". Archived from the original on 17 February 2012. Retrieved 9 February 2009.
  3. http://ftp.3gpp.org/tsg_sa/TSG_SA/TSGS_04/Docs/PDF/sp-99330.pdf
  4. "Daylight Saving Time and NITZ". www.howardforums.com. Archived from the original on 20 May 2010.
  5. "O2 stellt Handy-Uhren übers Netz". 28 November 2009.
  6. "Automatische Uhr im o2 Netz - Android-Hilfe.de". Archived from the original on 9 January 2010. Retrieved 27 January 2010.
  7. "Medilarm Pro | Personal Alarm | Alarms for the Elderly | Elderly Alarms". Archived from the original on 16 October 2011. Retrieved 19 January 2012.
  8. "Müşteri Memnuniyetinin Adresi - Şikayetvar".
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