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Understanding Cellular Technology and BandsThroughout the world, different frequencies are used to send and receive wireless calls within each country. The phone manufacturers (Nokia, Motorola, Samsung, etc…) then produce phones that will work within each countries network(s). To complicate the matter in the United States; AT&T, Verizon, T-Mobile, Sprint, and the other carriers, use one of four different technologies to transmit a call to your phone. The different technologies are known as GSM, CDMA, TDMA, and I-Den. GSM and CDMA are supported by most carriers, while I-Den and TDMA are being phased out. You can think of these technologies as operating systems for your phone.
Next Page - Analog, Digital - Does it Matter? »For the average user, it’s not very important what technology is being used by which carrier. Contrary to what you hear on commercials, every carrier uses and shares the same frequencies and the differences between technologies has little effect on the quality of the calls you make and receive. The more important factor is which carrier has better service in the particular areas in which you plan to use your phone — this is usually more dependent on which carrier has more cellular towers in the areas than anything else. Information regarding cellular protocols and frequencies is more important if you already have service with a carrier and you decide to purchase a phone by itself from an independent source. All phones being used in the U.S. should accommodate the 800/850 and 1900 bands to operate in most areas well, except on the T-Mobile and SunCom networks which operate solely on the 1900 bands. The 800 and 850 bands are actually the same, so don’t be confused by the two different numbers. 850 just means that the phone is GSM-only compatible, while 800 can be a GSM, CDMA, I-Den, or TDMA compatible. Any phone which lists the 800 or 850 + 1900 band in the phone specifications will work well in the U.S., as long as it is also supported by the carriers GSM, CDMA, I-den, and TDMA networks. Note that phones that are 1900 compatible but lack the 800/850 band will operate in some areas of the U.S. but not others; major metropolitan areas in particular tend to offer better 1900-band coverage. Carrier Technology and Frequency/Band Chart
Adding a replacement phone to your current carrier, U.S. only.
Frequency Bands Used throughout the WorldU.S Bands – 800/850, 1900 (CDMA, GSM, TDMA, or I-Den), 2100 CDMA 2000/EVDO What is GSM 850GSM 850 is simply GSM technology operating in the Cellular (800 MHz 850 MHz) frequency band. Both the technology and frequency band have been around for a long time, but only in 2002 were they combined. In the U.S. prior to 2002, GSM technology only operated in the PCS (1900 MHz) frequency band. GSM 850 addresses the needs of carriers with Cellular licenses switching from other technologies to GSM. Before the existence of GSM 850, the Cellular band was commonly referred to as the 800 MHz band. 850 MHz implies a different frequency band, but this is not the case. 800 MHz and 850 MHz refer to the exact same frequency band. 850 is technically a more accurate description of the frequency range, although 800 is still common when referring to CDMA and AMPS (analog) technology. Our fancy algorithm says this stuff is related...Saturday, November 08, 2008The site is great for those who are quite unfamailiar with the mobile and communications terminilogy. Thanks to phonedog. :) Wednesday, November 05, 2008hello,
i was wondering if T-Mobile would reject me for a free phone for their flexpay service, if on my credit report i have already verizon and sprint on my credit? i mean they werent defaults on payments just something that went wrong with billing that both companies would not fix cause it was not their fault.
but will T- Mobile deny me? Wednesday, November 05, 2008I have had a nice information from your website. great site.thx Wednesday, October 29, 2008hey Linnea,
Nokia N95 would be good for you. It has Wifi, 3G, GPS or maps, mp3 player and you could install a lot of good applications as well. I have the 8GB version and I'm with T-mobile. Saturday, October 18, 2008I need a phone with good GPS and instant messaging and Wifi and a big screen, speaker phone, voice command, of course bluetooth. I'm with T-mobile. What can I get that those things will work on their network? Like the GPS, will it work there with full data. I was set on the instinct then saw that there is no Wifi, oh and need something that can tether to computer for modem with on the boat! I have to buy soon so any help would be really great. Thanks Wednesday, October 15, 2008thats like saying its not worth it to pay your car insurance. i have a pda with tmobile and only paid a quarter of it to get a new one when it broke. its was sooooo worth it not to have to shell out another 500 for a new pda. Tuesday, October 14, 2008If I buy the Nokia n81 from the website can i use it for AT&T and T-mobile? and i live in the US. Thursday, October 02, 2008I live in a rural area. I just got a new Nokia 6555 and the signal reception is terrible. What phone has the best signal reception?? Sunday, September 14, 2008I have a verizon phone and i have to admit it`s great. Before I had tmobile but they were terrible. service sucked and the costumer service was crapy too. I bought the phone from small store retailer in brooklyn and i m happy with it. As far as online stores i think people are still not trusting online as person to person sale. I know yodaphone.com is pretty good at this with bunch of other sites. Cheers. Sunday, August 31, 2008hi noah,...i just wanna know how much is the LG env2,...
cauz i just wanna buy the phone only,...and it can be carry by verizon wireless,....and which is the better, env2 or sony ericson w580i??,....please,..reply to my questions,...thank you Sunday, August 24, 2008hey how are you doing Friday, August 22, 2008I have a helio fin phone and i haven't seen any reviews on it. I just wanted to know if i missed out on the episode. i really like this web site and thanks for all the hard work. Ray Wednesday, July 30, 2008iwantacelluarphonedownloadringtonesandbluetooth.andmustin31087zipcode. Tuesday, July 29, 2008I have had a nice information from your website. Keep it up! Tuesday, July 22, 2008Which firm would you go with for a two week GSM phone rental for use in Japan, with v/mail, calling to and from U.S.? Thursday, July 17, 2008Is there any plan that does not require a two year contract to start service. I have t-mobile, my contract is running out, but I am upset with the service we have had and don't want to have to commit to another two years, tho I can't seem to find a plan that works better for us
Wednesday, July 16, 2008I lost my ATT (GSM) phone and would like to buy a replacement so that I do not have to extend my existing phone plan. Because my phone is lost (fell in the bay), I cannot exchange the SIM card. Can I still buy a replacement phone with this plan? Friday, July 11, 2008this is informative1! can i have it please? Thursday, June 26, 2008Thanks for the good information on Insurance.. I thought I was the only one who thought it was nuts, but I never realized it was that bad. I think a manufacturer's warranty is good enough for me, but the Ebay idea is really smart! Tuesday, June 17, 2008This is a fantastic example of B2C ebusiness for sure i have liked it. |
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