Re: Explain "Unlocked" Phones to me.
So from a post yesterday about recommendations on a phone for my wife, we came across a ton of unlocked phones she likes. However on Amazon it shows GSM unlocked, working on ATT and T-Mobile services only. I know Verizon is/was CDMA, but didn't they add/get GSM? And isn't the point of an unlocked phone to use on other networks? Will GSM unlocked work on Verizon?
There are two main cellular network technologies: GSM and CDMA.
GSM is more common worldwide, but there are some CDMA networks like Verizon and Sprint.
The two are not compatible. Some Verizon/CDMA phones also have GSM hardware so that they can function more practically overseas. EX. The Verizon Lumia Icon works on GSM networks technically.
Also worth noting that Verizon will only allow specifically approved phones onto their network (for the most part, any phone that has VZW branding) despite being technically compatible with Sprint in some regards.
ATT does not have that whitelist for example.
GSM phones will not work on CDMA networks. The main GSM networks are ATT and T-Mobile in the US.
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Now, an unlocked phone can function on any network, technology allowing. Carriers sometimes lock phones to only function on their network because competition, etc. For example, you may buy an iPhone that is locked to ATT.
In order to use that phone on say, T-Mobile or a GSM network overseas, the phone will have to be "unlocked," which involves jumping through a hoop or two applying for an unlock code. (worth noting that unlocked phones are generally worth more.)
I hope I made sense.