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(More customer reviews)AT&T uses two frequencies for GSM service. Originally they only used GSM1900 but as the old analog and TDA 850 MHz networks are made obsolete they are being converted to GSM850. The SX56 supports GSM1900 (and GSM900 for roaming in Europe) but not the newer GSM850 service. As time goes on AT&T will enhance their GSM850 coverage but there are reports that they've done all they're going to do to improve GSM1900 coverage. So if you're lucky your service will be OK but if you have any signal issues with this phone it won't get any better
I have the TMobile version of this phone and it works well on the TMobile network since TMobile only uses GSM1900 across North America. But this SX56 version of the phone is sold "locked" to only operate on AT&T's network.
This is a problem with many AT&T GSM phones but it's particularly an issue with the SX56 because there aren't any suitable replacements (yet) with comparable functionality that support GSM850.
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The Siemens SX56 Pocket PC Phone represents an unprecedented Wireless PDA combination of mobile phone functionality, mobile Internet access, and Microsoft Office integration. The 4096-color touch screen and high-speed data transfer rates of the Siemens SX56 Pocket PC Phone combine to bring you a wireless experience unlike any other. Full functionality and accessibility brought to you by Microsoft Pocket PC Phone Edition Software create an exciting experience in the palm of your hand.The Siemens SX56 Pocket PC Phone offers you seamless integration with your existing Windows personal computer. Synchronize your calendar, e-mail, contacts and notes automatically. It uses GSM, the most widely used wireless technology in the world. With GSM technology, global mobility is within your reach.
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