Editing IDEN (section)

== Hardware ==
{{Unreferenced section|date=October 2009}}
The first commercial iDEN handset was Motorola's L3000, which was released in 1994{{Citation needed|date=October 2009}}. Lingo, which stands for Link People on the Go, was used as a logo for its earlier handsets. Most modern iDEN handsets use [[Subscriber Identity Module|SIM]] cards, similar to, but incompatible with GSM handsets' SIM cards. Early iDEN models such as the i1000plus stored all subscriber information inside the handset itself, requiring the data to be downloaded and transferred should the subscriber want to switch handsets. Newer handsets using SIM technology make upgrading or changing handsets as easy as swapping the SIM card. Four different sized SIM cards exist, "Endeavor" SIMs are used only with the i2000 without data, "Condor" SIMs are used with the two-digit models (i95cl, for example) using a SIM with less memory than the three-digit models (i730, i860), "Falcon" SIMs are used in the three-digit phones, (i530, i710) and will read the smaller SIM for backward compatibility, but some advanced features such as extra contact information is not supported by the older SIM cards{{Citation needed|date=October 2009}}. There is also the "Falcon 128" SIM, which is the same as the original "Falcon", but doubled in memory size, which is used on new 3 digit phones (i560, i930){{Citation needed|date=October 2009}}.
[[Image:iden.JPG|thumb|iDEN base radio at a cell site]]
The interconnect-side of the iDEN network uses GSM signalling for call set-up and mobility management, with the Abis protocol stack modified to support iDEN's additional features. Motorola has named this modified stack 'Mobis'{{Citation needed|date=October 2009}}.

Each base site requires precise timing and location information to synchronize data across the network. To obtain and maintain this information each base site uses [[Global Positioning System|GPS]] satellites to receive a precise timing reference {{Citation needed|date=October 2009}}.