GSM or CDMA in Poland?
They use GSM system, make sure that your phone is unlocked, if not get one.($10-$30 in US)
It is usually written on the box, definitely in the technical specifications.I could not even buy a phone if I don’t know first with which operator it could work.I understand in the US you have been used to by the phone directly from your operator. I have had the luxury in Europe to chose the phone and the operator separately.Furthermore some operators operate only a CDMA network, some others only a GSM network. You may find a list of CDMA US networks in here and a list of CDMA2000 networks worldwide here.In the past I could have said, if it has a SIM card is a GSM. Now it is no more true as some Verizon models require a SIM card (for the LTE network).
CDMA & GSM are two wireless technologies used for the communication from the base station (mobile tower) to the mobile devices (Phone / other terminals). Whereas the base stations are connected to servers via wired networks and servers are interconnected via internet (or parallel) channels.As all communication is transferred via servers, they have their own standards for interconnection and communication.This is the architecture which helps to connect between PSTN (old telephony, analog or digital) / VOIP / Mobiles / Satellite phones / etc…
There are a few ways:Check the box: If you have the original box of the iPhone handy, then it will print on there what kind of networks the iPhone supports— if it is a GSM iPhone, it will only mention support for GSM networks. If it is a CDMA iPhone (iPhone 4s and later), it will mention support for CDMA and GSM networks. If it is a CDMA iPhone 4, it will only mention support for CDMA networks. If it is a factory unlocked iPhone, it will also usually mention support for both types of networks.Note: If your iPhone’s box mentions support for “TD-SCDMA”, it does not necessarily mean it is a CDMA iPhone. GSM-only iPhones support that too. TD-SCDMA is not the same as the CDMA that U.S. networks use.Use the carrier: The easiest way, I think, is to go based on what network your iPhone is “for”. If it is originally a Verizon or Sprint iPhone, it is a CDMA phone, which, of course, also supports GSM (iPhone 4s and later). If it is an AT&T or T-Mobile iPhone, it is a GSM phone. You would have to look up other carriers like MVNOs and regional carriers. Factory unlocked iPhones obviously don’t have a carrier; but most recent ones support both GSM and CDMA, but I guess they are technically GSM iPhones.Check the IMEI: Find the IMEI in Settings > General > About. Use that number in a website like Swappa to look up the configuration of your iPhone. It will tell you what carrier your iPhone is from, and you can determine (see #2) whether its a CDMA or GSM iPhone.Look at your iPhone: If your phone is an iPhone 4 (which is a pretty old phone now), you can actually tell if its a CDMA or GSM iPhone just by looking at it. If it has a SIM card slot (right side of the iPhone), it is a GSM iPhone. If it does not have a SIM card slot, it is a CDMA iPhone. This is the only iPhone you can do this check on; later iPhones have a unified design in which both CDMA and GSM iPhones have SIM card slots (for LTE and international purposes).
What is the difference between CDMA and GSM?
The frequency and 'media' on a CDMA phone (an older technolgy) the radio settings etc are hard programmed into the phone and it uses a more ghetto system. on a GSM phone (a newer technolgy) the radio settings etc are programed onto a portable sim card that can move from phone to phone. It uses a more advanced system is the USA T-mobile and ATT are the only GSM providers. The rest are CDMA. GSM works better than CDMA. only in the USA, as we were early adopters of cell phones, does CDMA have market dominiance, anywhere else in the world GSM is the major player with few CDMA networks outside of the americas
BOOST is a CDMA based mobile network operator, with carrier/division/multiple/access. They are a part if sprint, with is also predominantly a CDMA network. However you will see this question a lot latley, mainly because a lot if CDMA phones now come with sim cards. This us because if the LTE, way information transfer basically requires a sim card or the UCCID it provides. Sprint and Verizon still have a lot of pure CDMA phones=no sum slot. Most phones with a sim card slot it can be unlocked to any GSM carrier, sometimes you will run into a phone that gives you issues, usually uts the presets in the radio and you can flash new firmware to it and done. So just cause you have a sim slot you are not necessarily on a GSM network. Verizon phones by the way if they are newer than a s2,and owned are usually network unlocked=means put a T-Mobile or at&t sim In it and it will work for calls, to get mms and internet you have to program it in a new apn, look up your carriers apn online and Follow the instructions. I buy cell phones for a shop I own and it never gets old when somebody says " hey I have this really nice Verizon phone but I'm not on Verizon!" I buy every single one of them:) sorry off topic, but yes CDMA.
What is the difference between GSM and CDMA?
The Global System for Mobile Communications (GSM) is the most popular standard for mobile phones in the world. GSM service is used by over 2 billion people across more than 210 countries and territories [1] [2]. The ubiquity of the GSM standard makes international roaming very common between mobile phone operators, enabling subscribers to use their phones in many parts of the world. GSM differs significantly from its predecessors in that both signaling and speech channels are Digital call quality, which means that it is considered a second generation (2G) mobile phone system. This fact has also meant that data communication was built into the system from very early on. GSM is an open standard which is currently developed by the 3GPP. Code division multiple access (CDMA) is a form of multiplexing (not a modulation scheme) and a method of multiple access that does not divide up the channel by time (as in TDMA), or frequency (as in FDMA), but instead encodes data with a special code associated with each channel and uses the constructive interference properties of the special codes to perform the multiplexing. CDMA also refers to digital cellular telephony systems that make use of this multiple access scheme, such as those pioneered by Qualcomm, or W-CDMA. CDMA is a military technology first used during World War II by English allies to foil German attempts at jamming transmissions. The allies decided to transmit over several frequencies, instead of one, making it difficult for the Germans to pick up the complete signal. CDMA has since been used in many communications systems, including the Global Positioning System (GPS) and in the OmniTRACS satellite system for transportation logistics. The latter system was designed and built by Qualcomm, and became the seed which helped Qualcomm engineers to invent Soft Handoff and fast power control, the necessary technologies that made CDMA practical and efficient for terrestrial cellular communications.
Is metropcs a CDMA or GSM carrier?
I'm thinking of buying a Galaxy note II or III but it is from US Cellular will it be compatible with my metropcs service? and is metropcs compatible with Verizon,at&t and Tmobile phones if so which ones I'm thinking of Samsung, LG or huawei the highest i am willing to pay for a phone is 250 as of now, thanks.
Sprint is primarily a CDMA carrier with GSM capabilities so to speak. Similarly to Verizon, Sprint only utilizes it's partial GSM network for access to its LTE network, when devices are roaming, & traveling internationally.It's the reason why a Sprint or Verizon iPhone 7/7 Plus will work on AT&T or T-mobile's network but a AT&T or T-mobile iPhone 7/7 Plus will not work on Verizon or Sprint