Type Allocation Code (TAC) is a part of the code IMEI used to identify devices Wireless .
The TAC corresponds is a number of 8 digits that identifies a particular model of movable telephone or GSM, UMTS or another radio network that code IMEI has supported.
Previous to 1 of April of 2004, the standard for code IMEI included a number of 6 digits called Type Approval Code (also TAC), that it indicated that a particular device was approved by an official organism; and Final Assembly Code (FACE), that it identified of unique way the manufacturing company of the model (that always does not agree with the mark indicated in the housing of the device).
As of that date many states and organisms that used GSM (mainly in Europe ) decided not to continue with the necessity to approve each device by a national organism, however, from then they would be the same manufacturers who would autoregularían themselves. This took to the fact that from then the manufacturers they would have to ask for codes TAC for each new device to the international organism of standards GSM, instead of to have to ask for the approval of each device to a national organism.
As much one as another code TAC, the code can be used to identify the model of used device (although some can have more of a code following the revision, the assembly place…).
In both types of TAC, the first two digits they indicate the country of origin of the device. (In the Type Approval Code, it indicates the country of the national organism that approved the device.) These codes are based on list ITU-T E.164 with the codes of international calls, certain variations (for example; 50 for Taiwan; 35 for Finland).
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