Used Cell Phones: CDMA vs GSM Networks
By purchasing used cell phones from a third party, you avoid the need to sign up for a new contract with a cellular provider (typically 1 or 2 years). Instead, you can approach the provider with a phone that you buy on your own and have them activate it and completely bypass any conversations about a contract – allowing you to move to a different provider at a later date if you choose to without paying steep cancellation fees.
If this sounds enticing, you need to understand the different types of technology that are used in cell phones before you buy a refurbished or used cell phone. More importantly, you need to know what technology your preferred provider operates on.
Code Division Multiple Access (CDMA) technology has long been the dominant technology for mobile networks in North America and Asia. However, Global System for Mobile Communications (GSM) technology us currently used in both North America, Asia, and the majority of other continents. It is estimated that 85% of the global market uses phones on a GSM platform, making it the preferred choice for most cell phone manufacturers that design new handsets.
It is not too hard to tell one type of phone from another. GSM phones use a SIM card and CDMA phones do not. If you buy a used blackberry made for GSM networks, activating it is as simple as putting your SIM card (which you get from your provider) into the new (used) phone. The phone will then be able to connect to the network that the SIM card is associated with. This is particularly advantageous for people that do a lot of international travel as you can avoid expensive roaming fees by getting a prepaid SIM card for the international network you plan to operate on.
CDMA phones require a bit more effort to activate, but the process is still relatively simple. The process is simple enough to explain, but the reality is that you will either need to visit a local store for your provider or call their customer support, who will walk you through the process.
Wondering if you should buy a GSM or a CDMA phone? Well, that choice will ultimately come down to your own personal preference or may be impacted by the fact that you already have an existing line with a certain provider that you want to keep. Alternatively, you can compare the carriers based on your criteria of needs and pick the best fit before you begin searching for a phone that is compatible with the technology that they use.
In terms of service, both technologies offer similar levels of coverage area, call quality, and data transfer speeds. Of course, the amount of coverage you get will be dependent on your provider, not necessarily the phone that you choose. If you do a lot of traveling, make sure that you ask your provider about roaming fees, as these can get expensive.
Finally, when shopping for used cell phones, you need to keep in mind the features and applications that you plan to use on the phone. Certain features or phones are only able to work fully on one network (like the iPhone) and some providers charge extra to use certain features, so make sure you check in to these things before you make any purchases or activate a phone to avoid surprises on the bill down the road. And, remember to only buy used AT&T cell phones from reputable dealers (like those that offer a warranty) and/or trusted sources.
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