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Unlocked Cell Phone   locked Cell Phone    What does it mean?

 

What is an Unlocked Phone?

Unlocked" phones are not restricted to service providers and can be used on different networks. For example, an unlocked AT&T iphone will work on the T-Mobile network by simply inserting a T-Mobile SIM card.
 
 

What is a locked Phone?

A locked phone is a device that can only be used with one provider; its usability is “locked” to only one network. Locked phones will not accept other carriers’ SIM cards, including international SIMs.
 
 

Which phones can be unlocked?

Nearly any GSM cell phone can be unlocked and used on the network of your choice. GSM cell phones are devices that use SIM (Subscriber Identity Module) cards, including most AT&T and T-Mobile phones.
 
 
Which phones cannot be unlocked?
There are two types of cell phones in the US—GSM and CDMA phones. CDMA phones, those used on Verizon, Sprint, and MetroPCS networks, do not use SIM cards and therefore cannot be unlocked to use on different networks at this time.
 
 
How can I activate an unlocked phone?
With an unlocked cell phone, you don’t have to worry about activation because it is ready to go. Just pop in your current SIM card and turn the cell phone on. You’ll be up and running instantly.
 
 
Which carriers can use unlocked phones?
You will be able to use your unlocked cell phone with any network that utilizes SIM cards. Not only does that include two of the major US carriers, AT&T and T-Mobile, but also dozens of networks outside the US, making it easy for you to travel abroad and use your phone without having to pay expensive roaming or international fees.
 
 

 

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Can I use an unlocked phone with Verizon/Sprint/Metro PCS service?  
Verizon, Sprint, and MetroPCS are CDMA networks and do not use SIM cards therefore unlocked phones will not work on these networks.  

 

 
   
Can I use a Sprint phone with Verizon service (vice versa)?  

No. Sprint and Verizon restrict the use of their phones to their networks and there is currently no way to “unlock” their phones.

 
   
   
What is dual band, tri band, quad band? Which one do I need?  
Dual, tri, and quad bands refer to frequency bands. These bands are the frequencies in which cell phones are able to transmit data in various areas and countries. Though there are more than four frequencies used worldwide, some frequencies are more popular than others. For example, 900 MHz is the most commonly used frequency band and the 1900 MHz band will improve services in countries that use 900 MHz.  
   
   
What is the difference between GSM and CDMA?  
GSM and CDMA indicate the type of data transmission service providers operate on. AT&T and T-Mobile operate on GSM networks; Verizon, Sprint/Nextel, and Alltel operate on CDMA networks. GSM networks require SIM cards.  
Which type of phone you need depends on where you will be using it. A dual band phone is typically sufficient for service in most countries. Luckily, tri and quad band phones are becoming the standard, making unlocked GSM phones all the more useful. For a complete
list of which frequency a country uses, visit
 
http://www.gsmworld.com/roaming/gsminfo/index.shtml  
   
   
Which band does my service provider operate on?  
T-Mobile primarily operates on the GSM 1900 MHz band which means most tri-band and all quad-band GSM phones will work on the network. AT&T’s network primarily operates on the GSM 850 MHz band which usually requires a quad-band or AT&T-branded tri-band phone. However, AT&T’s network is complex and the only way to find out if a phone will work with the network is to contact AT&T. Verizon operates on CDMA 800 / 1900 MHz bands. Sprint operates on the CDMA 1900 MHz band. Please note that although Verizon and Sprint operates on the CDMA 1900 MHz band, phones cannot be used interchangeably between the networks.  
   
   

Does "quad-band" mean it will work i all countries?

 
Yes, quad-band phones will typically work on any GSM network worldwide.  
 

 

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