Buy an Unlocked Cell Phone – Know the Difference CDMA Vs GSM
Mobile phone carriers in the U.S. and the world are working on two different types of networks: Code Division Multiple Access (CDMA) and Global System for Mobile Communication (GSM). Though each technology transmits voice and data, they do so in different ways, which is not a compatible phone, if you do not have the right plan. As a result you can not a CDMA phone and use it on GSM or vice versa. GSM phones can be taken to other countries as well (as long as the frequency of use is compatible – see the section on dual band / tri band / quad-band phones) will be.
Verizon, Sprint, Cricket, Alltel, U.S. Cellular, Cellular South, all work with CDMA networks. You want a phone that can “CDMA” is mentioned in the description. If the description says, works for Verizon, the phone will only work on the Verizon network, and the same for Sprint, Alltel, U.S. Cellular, Cellular South, Metro PCS, Cricket, etc.
AT & T, T-Mobile, Fido, Vodafone, Orange and Rogers Wireless and many other global GSM providers worldwide operate on “GSM” network. If the phone says explicitly: “guaranteed work with AT & T” for example, the phone is currently locked “and only with AT & T and the same for T-Mobile and to work so on. These phones can be unlocked usually easy to work with any GSM carrier that uses a SIM card, is for a small fee (to be used from $ 8 – $ 20) and the ability to unlock the phone from the model of the phone you buy.
GSM unlocked cell phones –
When the phone states “Unlocked” in the title and / or description you just take you to unlock your SIM card from your existing GSM phone and put it into another GSM phone. If the description says unlocked, you can use on any GSM network worldwide. Only GSM phones can be unlocked, so please look for the word GSM in the description. You must also ensure that the frequencies supported by the phone, compatible with the current mobile service provider. Here are some of the most popular airlines and the frequencies they operate on. You may just want to do a quick Google search to see what a particular frequency phone / carrier to operate to assure you the clearest reception with your phone to have.
Can my Verizon / Alltel / Sprint / US Cellular / Cellular South phone be unlocked?
No, unfortunately not. . . All of the above carriers operate on CDMA networks and therefore can not be unlocked. Note that only GSM phones can be unlocked. Some CDMA phones are now compatible with GSM Dual Sim card to be used internationally, but for the most part CDMA phones can not be isolated.
Can my AT & T / Cingular / T-Mobile, Rogers cell phone be unlocked?
Yes! Now for the most part. Most GSM phones can be unlocked. All of the above institution ntworks work on GSM. All of these wireless providers, to provide you with a SIM card after activation. If you are an AT & T phone and want your current service plan with AT & T mobile phone to another use of what you need to do is take your SIM card and place it in the other AT & T cell phone and you Freel can use the phone. If your phone uses a GSM SIM card, it can be unlocked. Locking a phone is a way for carriers to its customers from switching to cell phones to prevent other carriers. Once you have a specific carrier, they do not want you to go so easily. Carriers also have deals with major mobile phone manufacturers to ensure phone exclusively for them, and they pay big $ $ $ and try to prevent people just use the opportunity to have their phones on other networks.
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on Jul 26 2010. Filed under Blackberry.
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