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Cellular Phone Forum / General / GSM / December 2004gsm frequencies
I just picked up an old T28W, hoping to use it here in Rochester, NY with Cingular service. It doesn't work -- so now I'm curious what frequencies are used in what locations. Does anyone know of a map showing GSM coverage by provider & frequency? Is there a feature on Nokia or Ericsson phones that will tell me the frequency band of the current network? For Rochester, NY with Cingular: Ericsson T237 (GSM 850, 1900) is offered in Rochester. Ericsson T616 (GSM 850, 1800, 1900) works in Rochester. Ericsson T28W (GSM 900, 1900) does NOT work in Rochester. Conclusion: Cingular GSM in upstate New York uses GSM 850. An odd thing happens, though. The phone connects happily to a network labelled "US 380" but then goes to "Emergency calls only" mode. I thought that Cingular allowed roaming to other networks, but I guess not. Somewhere I read that "US 380" is AT&T. Is that true? Why's it called "US 380"? Since Cingular owns AT&T Wireless, why doesn't the phone roam to US 380? --tobin >I just picked up an old T28W, hoping to use it here in Rochester, NY with >Cingular service. It doesn't work -- so now I'm curious what frequencies >are used in what locations. Does anyone know of a map showing GSM >coverage by provider & frequency? Is there a feature on Nokia or Ericsson >phones that will tell me the frequency band of the current network? The only GSM 1900 (which the T28W uses in addition to GSM 900) is T-Mobile or AT&T Wireless (if they serve that area.) Rochester no doubt uses GSM 850. Pretty much all the cingular markets use GSM 850 exclusively except for the west coast (CA/NV/WA) and the Carolinas and also the Philadelphia area I believe use 1900. The T28W will no doubt not work in Rochester or anywhere else that cingular just uses GSM 850. As for which areas use what frequency go to wirelessadvisor.com and plug in a ZIP code. - - - - - - - - - - - - - - - - - - - - - - - - - - >The only GSM 1900 (which the T28W uses in addition to GSM 900) is >T-Mobile or AT&T Wireless (if they serve that area.) Rochester no >doubt uses GSM 850. Pretty much all the cingular markets use GSM 850 >exclusively except for the west coast (CA/NV/WA) and the Carolinas and >also the Philadelphia area I believe use 1900. So does the NY Metro market, in which Cingular leases time on T-Mobile's system, in addition to now having the old AT&T system. --- CellPhonesEtc at optonline dot net > The only GSM 1900 (which the T28W uses in addition to GSM 900) is > T-Mobile or AT&T Wireless (if they serve that area.) > Rochester no doubt uses GSM 850. Pretty much all the cingular markets > use GSM 850 exclusively Ah, this makes sense. I took the phone out the other day, and it worked fine, although signal coverage was much reduced. I think it's successfully talking to the AT&T Wireless network but not Cingular, which jives with my experience with a tri-band phone. The T28W works in areas where the tri-band phone displayed "AT&T Wireless" as the carrier but not where it displayed "Cingular". > also the Philadelphia area I believe use 1900. The T28W will no doubt > not work in Rochester or anywhere else that cingular just uses GSM 850. > As for which areas use what frequency go to wirelessadvisor.com and plug > in a ZIP code. Nice site. It shows tons of 1900 MHz coverage in Rochester, including T-Mobile and two entries for Cingular. Another entry for Cingular is 800 MHz. I'm guessing that at least one of the 1900 MHz Cingular entries is actually the re-named AT&T Wireless network. Do you know if Cingular allows roaming to T-Mobile networks? Tobin >> The only GSM 1900 (which the T28W uses in addition to GSM 900) is >> T-Mobile or AT&T Wireless (if they serve that area.) [quoted text clipped - 20 lines] > >Do you know if Cingular allows roaming to T-Mobile networks? The used to., and Cingular is 1900Mhz in Nevada in California on the old PBMS network. >Tobin >Do you know if Cingular allows roaming to T-Mobile networks? Only in certain areas such as New York City metro where they are co-users of the network in the opposite way that T-Mobile uses the cingular network in California and Nevada. There may be other areas as well. Usually roaming is not available if the native carrier has their own facilities in the area. If they don't and a roaming agreement is in place you can use the network no matter who it is. The important thing is that a roaming agreement needs to be in place. If there's no roaming agreement you cannot use a foreign system. - - - - - - - - - - - - - - - - - - - - - - - - - - >I just picked up an old T28W, hoping to use it here in Rochester, NY with >Cingular service. It doesn't work -- so now I'm curious what frequencies [quoted text clipped - 16 lines] >"US 380"? Since Cingular owns AT&T Wireless, why doesn't the phone roam >to US 380? If the carrier code wasn't defined at the time the phone was buit, and it isn't in the sim, you get either a country name (because the Country Codes for carriers have been place for a long time, they get resolved). You T28 almost certainly predates AT&T's decision to go GSM. So there is no entry in the ROM on the phone for carrier code 380 in the USA. I had a very old Ericsson (900Mhz) that in various countries just displayed a pair of codes. One for Country, one for carrier. YOu may have to check with Cingular about why you cannot roam on AT&T. It should be automatic at this point, but Murphy is alive and very well thank you. >--tobin > If the carrier code wasn't defined at the time the phone was buit, and > it isn't in the sim, you get either a country name (because the > Country Codes for carriers have been place for a long time, they get > resolved). You T28 almost certainly predates AT&T's decision to go > GSM. So there is no entry in the ROM on the phone for carrier code 380 > in the USA. Any suggestions for where to look up carrier codes? tobin >> If the carrier code wasn't defined at the time the phone was buit, and >> it isn't in the sim, you get either a country name (because the [quoted text clipped - 4 lines] > >Any suggestions for where to look up carrier codes? http://www.gsmworld.com and look for members' network information. <http://www.gsmworld.com/roaming/gsminfo/index.shtml> It should state what the MCC/MNC (Mobile country code/mobile network code e.g. 310-26 is the MCC/MNC for T-Mobile. MCC/MNC for cingular is either 310-15, 310-17, 310-41, and perhaps others. AT&T Wireless is 310-38 IIRC. 234-10 is is O2 in the UK. 302-37 is Microcell in Canada. Rogers Wireless is 302-37 - - - - - - - - - - - - - - - - - - - - - - - - - - >> If the carrier code wasn't defined at the time the phone was buit, >> and it isn't in the sim, you get either a country name (because the [quoted text clipped - 6 lines] > > tobin Here is a URL to a list maintained by the International Telecommunications Union (the FCC of the United Nations). http://www.itu.int/ITU-T/inr/forms/files/mnc-1203.pdf John C. |
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