> Does anyone know how TAC codes (part of the IMEI) are issued?
Local administrative bodies are assigning TACs to local manufacturers,
the complete list is administrated by the GSM Association in Dublin.
> trying to find a way to map handset make/model to TAC
Hard. Neither local authorities nor GSM in Dublin are willing to help
with this.
But have a look here:
http://www.nobbi.com/tacquerydb.htm
This seems what you are starting to do.
N.