Two basic technologies in mobile phones, CDMA and GSM represent a gap you can't cross. CDMA (Code Division Multiple Access) and GSM (Global System for Mobiles) are shorthand for the two major radio systems used in cell phones.
There are several variants and options carriers can choose, like toppings on their technological ice cream. It's much easier to swap phones on GSM networks, because GSM carriers put customer information on a removable SIM card. 3G CDMA networks (known as "EV-DO" or "Evolution Data Optimized") also, generally, can't make voice calls and transmit data at the same time. On the other hand, all 3G GSM networks have simultaneous voice and data, because it's a required part of the spec. The pulsing of the time division signal created the notorious "GSM buzz," a buzzing sound whenever you put a GSM phone near a speaker.
Code division turned out to be a more powerful and flexible technology, so "3G GSM" is actually a CDMA technology, called WCDMA (wideband CDMA) or UMTS (Universal Mobile Telephone System).
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The global spread of GSM came about because in 1987, Europe mandated the technology by law, and because GSM comes from an industry consortium. GSM Means to YouFor call quality, the technology you use is much less important than the way your carrier has built its network.
The SIM cards are generally there for Sprint's and Verizon's 4G LTE networks, because the LTE standard also uses SIM cards. Once more, that's an available option (known as "SV-DO" for "Simultaneous Voice and Data Optimization"), but one that U.S. Bell and Telus in Canada have done it, to get access to the wider variety of off-the-shelf GSM phones. That's mostly gone now, because 3G GSM (as I explain later) isn't a time division technology. WCDMA requires wider channels than older CDMA systems, as the name implies, but it has more data capacity. The smartphone has an expandable memory of up to 64 GB, as well as 8 GB of internal memory. Use Wirefly’s innovative cell phone and plan comparison tools to ensure you are getting the best deal on the market. In this story, I'll try to explain who uses which technology and what the real differences are.
There are good and bad CDMA and GSM networks, but there are key differences between the technologies. That means you can only switch phones with your carrier's permission, and a carrier doesn't have to accept any particular phone onto its network.

The phones may also have SIM slots to support foreign GSM networks as "world phones." But those carriers still use CDMA to authenticate their phones on their own home networks. But Verizon and Sprint are big enough that they can get custom phones built for them, so they don't see the need to waste money switching 3G technologies when they could be building out their 4G networks.
They're ways for people to cram multiple phone calls or Internet connections into one radio channel.
Every call's data is encoded with a unique key, then the calls are all transmitted at once; if you have calls 1, 2, and 3 in a channel, the channel would just say 66666666. To further speed things up, the 3GPP (the GSM governing body) released extensions called HSPA, which have sped GSM networks up to as fast as 42Mbps, at least in theory. Also, the Lumina 820 has an 8-megapixel rear-facing camera, 1.3-megapixel front-facing camera with great photo quality. Shop with confidence knowing that Wirefly wants to help you find the best prices on cell phones and cell phone plans. When Verizon's predecessors and Sprint switched from analog to digital in 1995 and 1996, CDMA was the newest, hottest, fastest technology. Your voice is transformed into digital data, which is given a channel and a time slot, so three calls on one channel look like this: 123123123123. The receivers each have the unique key to "divide" the combined signal into its individual calls. On the other end, the receiver listens only to the assigned time slot and pieces the call back together.

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