It is going to take a hell of a lot of new towers in rural areas to
replace 2G with 3G.
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http://www.sec.gov/Archives/edgar/data/732717/000073271712000073/q2_10q.htm
Also as part of our ongoing efforts to improve our network performance
and help address the need for additional spectrum capacity, we intend to
redeploy spectrum currently used for basic 2G services to support more
advanced mobile Internet services on our 3G and 4G networks. We will
manage this process consistent with previous network upgrades and will
transition customers on a market-by-market basis from our Global System
for Mobile Communications (GSM) and Enhanced Data rates for GSM
Evolution (EDGE) networks (referred to as 2G networks) to our more
advanced 3G and 4G networks. We expect to fully discontinue service on
our 2G networks by approximately January 1, 2017. Throughout this
multi-year upgrade process, we will work proactively with our customers
to manage the process of moving to 3G and 4G devices, which will help
minimize customer churn. As of June 30, 2012, approximately 12 percent
of our postpaid customers were using 2G handsets. We do not expect this
transition to have a material impact on our operating results, but will
continue to evaluate the financial impact of transitioning customers
from 2G devices to 3G or 4G devices.