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>AT&T was using GSM back when it was Cingular, before the 3G rollout. They were using it up until the end of 2016. https://www.att.com/esupport/article.html#!/

>AT&T was using GSM back when it was Cingular, before the 3G rollout. They were using it up until the end of 2016. https://www.att.com/esupport/article.html#!/wireless/KM1084805 https://www.att.com/esupport/article.html#!/wireless/KM10848... > So did the progenitor to T-Mobile. T-Mobile still uses GSM1900 nationwide and GSM850 (not well known that they do) in Myrtle Beach, SC. >I think on different frequency bands, limiting the usefulness of international phones. You don't know what you're talking about, stop spreading misinformation. There are small rural/regional carriers that still use GSM1900 or GSM850 in areas, I can think of Indigo Wireless out in west PA as one of the companies.

maxerickson 10y ago
> They were using it up until the end of 2016. >T-Mobile still uses GSM1900 nationwide and GSM850 (not well known that they do) in Myrtle Beach, SC. I wasn't trying to establish that they had stopped, I was pointing out that they adopted it quite some time ago. Perhaps "international phone" was the wrong term, my intent was to say that phones sold in Europe often wouldn't work in the US. Was that not the case? Oh, I see in https://news.ycombinator.com/item?id=13792767 https://news.ycombinator.com/item?id=13792767 that you agree with that. Sorry if I used the wrong words. Hasty interpretation of https://en.wikipedia.org/wiki/GSM_frequency_bands https://en.wikipedia.org/wiki/GSM_frequency_bands at least indicates that different frequencies were used in different areas.
- joecool1029 10y ago
  > I wasn't trying to establish that they had stopped, I was pointing out that they adopted it quite some time ago. My apologies, I wrongly assumed we were talking about the current network landscape. You would be correct. > Hasty interpretation of https://en.wikipedia.org/wiki/GSM_frequency_bands https://en.wikipedia.org/wiki/GSM_frequency_bands at least indicates that different frequencies were used in different areas. If memory serves. In the US it was GSM1900 up until the late 90's/early 2000's, AT&T Wireless decommissioned their legacy TDMA network at the time on 850mhz and shifted to using 850mhz for GSM due to better rural signal propagation. Worldwide outside north america's 850/1900, there is 900/1800, and to a much lesser extent maybe 450 for siberia, and in other places likely better served by satellite.

maxerickson 10y ago

> They were using it up until the end of 2016. >T-Mobile still uses GSM1900 nationwide and GSM850 (not well known that they do) in Myrtle Beach, SC. I wasn't trying to establish that they had stopped, I was pointing out that they adopted it quite some time ago. Perhaps "international phone" was the wrong term, my intent was to say that phones sold in Europe often wouldn't work in the US. Was that not the case? Oh, I see in https://news.ycombinator.com/item?id=13792767 https://news.ycombinator.com/item?id=13792767 that you agree with that. Sorry if I used the wrong words. Hasty interpretation of https://en.wikipedia.org/wiki/GSM_frequency_bands https://en.wikipedia.org/wiki/GSM_frequency_bands at least indicates that different frequencies were used in different areas.

joecool1029 10y ago
> I wasn't trying to establish that they had stopped, I was pointing out that they adopted it quite some time ago. My apologies, I wrongly assumed we were talking about the current network landscape. You would be correct. > Hasty interpretation of https://en.wikipedia.org/wiki/GSM_frequency_bands https://en.wikipedia.org/wiki/GSM_frequency_bands at least indicates that different frequencies were used in different areas. If memory serves. In the US it was GSM1900 up until the late 90's/early 2000's, AT&T Wireless decommissioned their legacy TDMA network at the time on 850mhz and shifted to using 850mhz for GSM due to better rural signal propagation. Worldwide outside north america's 850/1900, there is 900/1800, and to a much lesser extent maybe 450 for siberia, and in other places likely better served by satellite.