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Why 1800 Mhz and not 900?
I've been with TMobile for several years and I always thought its compatibility with worldwide GSM networks was a major advantage. In fact, I thought it was OK that TMobile only used 1900 here, so all standard tri-band phones (900/1800/1900) were good both in the US and everywhere else. This compatibility, as well as a close relation with the global TMobile system, has been a selling point for TMobile to people who travel, something that VZW or even Cingular could never match. Have you noticed how many celebrities use TMobile? Because they travel a lot! Seems like a good idea for a niche market. BTW, TMobile seemed to recognize that overseas 900 is the primary band since they offered dual-band 900/1900 phones (Samsungs, I think).
Ok, so n...
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With increasing 850 MHz availability, of course T-Mobile is going to have to come out with phones that support it. However, there will always be variations that support different bands.
850/1900
900/1900
900/1800/1900
850/1800/1900
850/900/1800/1900
Just like verizon offers tri-mode vs. all digital phones (for example), theres going to be one in the mix that will suit your needs.
To answer your question on if T-Mobile can guarantee you will always have 1800 MHz coverage: no. In fact we can never guarantee you will have coverage including here! (Read the terms and conditions, paragraph 6)
To find out what frequency you need for what ever country you are roaming in/going to, click on the drop down menu, select the country fr...
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