fiercewireless.com

The fallacy of unlocked phones

"However, this does not work nearly as well in the United States and now Canada for a number of reasons. First, AT&T, T-Mobile USA, and other smaller network operators follow the European standards for GSM and UMTS/HSPA but Sprint Nextel, Verizon Wireless and a number of smaller operators have chosen to deploy CDMA2000 1X and EV-DO Rev A in this country. So it should be safe to assume that at the very least you could buy a GSM/HSPA-capable phone and move it from T-Mobile to AT&T or the other way around.

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