freitasm: If they had gone 850 MHz GSM there would be problems in the future when they needed 3G coverage. 2100 MHz spectrum wasn't available everywhere, and it performs terribly in cities, with low range in rural areas. 850 MHz 3G is the best future proof move they could've done.
It is unfortunate that Telecom did not think of this when negotiating with Alcatel-Lucent for a $384million contract to convert its network to GSM.