Frequencies for Cingular & AT&T in SF Bay Area [Archive] - Glock Talk

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Jack Straight
11-11-2004, 13:49
I need to buy some mobile phones for a test system. I currently have phones that work at 900/1800/1900Mhz, and they work fine for Cingular and AT&T in the San Franciso Bay Area.

We recently took them to Ohio, and they would not work for Dobson Communications (CellularOne). They use 850Mhz.

My question is, if we buy some 850/1800/1900 or 850/1900 phones, they should work for Dobson, but will they work for Cingular?

Yes, I will call Cincular also, but it takes a long time to get through to a technical person.

0100010
11-11-2004, 15:50
Do any manuf. make 850/1900 phones?

If they exist - are they on the same carrier type? TDMA/CDMA/AMPS/GSM

If you do find a phone compatible to both frequencies and that will work for both transmission types (or if they happen to match), then all you would really need is Cingular to add that phones ESN to its subscriber pool.

irobinson
11-14-2004, 23:08
If it is 850MHz it is most likley some kind of CDMA or TDMA system. Old AT&T used TDMA800 for their digital network. Verizon uses CDMA800 and Sprint uses CDMA1900.

Cingular and newer AT&T phones (soon Cingular anyway) use GSM1900 for their transmission (also a TDMA-type setup but different than the old AT&T).

Nextel uses iDen which is also a TDMA based technology from what I have heard.

A GSM phone will not talk to a CDMA/TDMA network and vice-versa. No manufacturer makes an AMPS/CDMA/TDMA and GSM phone all-in-one. It wouldn't be practical. They do make CDMA 800/1900 phones but I have no idea who does. You can buy GSM 900/1800/1900 phones all day.

Jack Straight
11-16-2004, 14:27
Got the two phones, in, and they work fine on Cingular's network.

Nokia 6340i: http://www.nokiausa.com/phones/6340i/0,2803,feat:1,00.html
GSM 850/1900 Mhz, TDMA 800/1900 Mhz, AMPS 800 Mhz

Nokia 6620:
http://www.nokiausa.com/phones/6620/0,2803,feat:1,00.html
GSM/EDGE/GPRS 850/1800/1900 MHz

We'll see how they work at Dobson.

mattyk6
11-16-2004, 21:58
Keep us updated!

unixglocker
11-16-2004, 23:10
How about get a different carrier that works in all states?

Jack Straight
12-07-2004, 22:59
The 6620 and 6340I worked great at Dobson. We even bought a 320 while there.

One thing, my Cingular phone seemed to burn up the battery quicker when roaming. Or maybe it is just getting old.

Unixglocker: We don't want a carrier that works everywhere. We are doing testing for different carriers, so we have to use their networks. We do some inter-carrier testing, and that is where the numbers get interesting.

For example, most carriers can deliver an SMS within their network in under 10 seconds. But between networks, it can be 30 seconds to 30 minutes! Strangely, we have seen the times increase steadily, then fall back hard to 30 seconds.

Goober35
12-08-2004, 16:28
Originally posted by irobinson
If it is 850MHz it is most likley some kind of CDMA or TDMA system. Old AT&T used TDMA800 for their digital network. Verizon uses CDMA800 and Sprint uses CDMA1900.


850mhz is a gsm. TDMA/CDMA is old school **** like WWII ****. They dont even work the same. GSM is in 0' and 1's aka bionarly (sp)
cdma/tdma is anilog.

Jack Straight
12-14-2004, 23:53
TDMA & CDMA are not the same at all. CDMA is binary (digital) also. In fact, my understanding is that the new UTMS standard uses the CDMA technology for the radio side, and GSM technology for the switching side.

CDMA is not old school...there is CDMA2000 and other modern standards.