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I think there is a big misunderstanding what locked/unlocked means.

All phones that are made are always assigned to a carrier (yes even the ones that say "Factory GSM Unlocked") to prove that just look up the model of the phone and you will see what carrier it was assigned to.

In order for a phone to have service the company has to know that you want service on this phone.

In the past company's like Sprint and Verizon did not work with a sim card they worked with the id of the phone to recognize what kind of phone / what carrier it was assigned to. This is know as CDMA. Yet company's like att/t-mobile did that too but the service was applied by using a sim.

Once LTE came out for what ever reason all company switched to the "Sim technology". There is still one thing that did not change, each carrier has their assigned bands that they have from the FCC that they are allowed to use.

Being that there are standard bands that every one uses (for international or the like) these are included in every phone. So.... All verizon phones will work on att, BUT will only have the bands for slower internet since those are standard bands.

Now verizon's LTE band is NOT a standard nor is their CDMA a standard so an att or a t-mobile phone will NOT be able to accept a Verizon sim.

Now lets go to sprint phones,

All other company's when they had the phones made for them all they do is have it customized for its own use (Read: their own LTE bands). Sprint on the other hand not only did they have them customize it they put a lock in the software blocking all local USA bands (Verizon ATT and Tmobile).

They even go a step farther and they still do the old way of checking the device ID to see if its a sprint phone or not.

Hope this explains a few things feel free to ask any questions.

Att has an easy way to ask for an unlock https://att.com/deviceunlock

How to check a Sprint iPhone (only): You cannot check it with an american sim you must put in a foreign sim. You DO NOT have to backup and restore as sprint sends in the email! Connect to wifi before starting this procedure.

When you put the sim in one of 3 things will happen.
1. It will say no service in the top right corner = Unlocked
2. It will do a soft restart and ask you for your apple id password = Almost unlocked, after putting in the password its unlocked
3. It will do a soft restart and say "Sim not valid" = Phone is locked

If you got number 2. and you dont know the password just put in your old sim and all will return. When you find out the password repeat the steps.

Willmyphonework.net Can check if the phone will work
« Last edited by yakov116 on June 29, 2016, 01:34:42 PM »

Author Topic: cell phone unlocking  (Read 37362 times)

Offline lazalaz

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Re: cell phone unlocking
« Reply #30 on: August 06, 2010, 11:51:16 AM »
Please read the post I was responding to:

Please read my post as well

Depends on the phone/carrier. Usually yes, but not at the speed that it would work on it's home carrier.


Offline Avid Reader

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Re: cell phone unlocking
« Reply #31 on: August 26, 2010, 10:34:02 AM »
I'd just buy a cheap prepaid GSM phone for $15. Nokia's are usually very easy to unlock.


How do I unlock an ATT Nokia 2330?

Not sure yet but will prob. use with sprint.

Offline moish

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Re: cell phone unlocking
« Reply #32 on: August 26, 2010, 10:37:02 AM »
can anyone help me unlock a nokia 6500c?

Offline elikay

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Re: cell phone unlocking
« Reply #33 on: August 26, 2010, 10:39:09 AM »
I don't think you can use Att on Sprint.

Offline Avid Reader

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Re: cell phone unlocking
« Reply #34 on: August 26, 2010, 10:40:25 AM »
I don't think you can use Att on Sprint.

Even w a cheap GSM?

What can it be used with then?

Offline Chaikel

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Re: cell phone unlocking
« Reply #35 on: August 26, 2010, 11:39:40 AM »
Sprint doesn't use GSM
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Offline gozalim

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Re: cell phone unlocking
« Reply #36 on: August 26, 2010, 11:54:28 AM »
Even w a cheap GSM?

What can it be used with then?
tmobile

Offline Chaikel

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Re: cell phone unlocking
« Reply #37 on: August 26, 2010, 12:09:51 PM »
Verizon in about a year
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Offline elikay

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Re: cell phone unlocking
« Reply #38 on: August 26, 2010, 12:31:04 PM »
Sprint and verizon are CDMA while Att and Tmobile are GSM. Usually if its a sim then it won't work on Sprint.

Offline AsherO

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Re: cell phone unlocking
« Reply #39 on: August 26, 2010, 01:03:53 PM »
Verizon in about a year

You didn't quote, so I'm not sure who/what you're responding to.

Are you saying VZW will be GSM in a year???
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Offline Chaikel

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Re: cell phone unlocking
« Reply #40 on: August 26, 2010, 01:06:52 PM »
You didn't quote, so I'm not sure who/what you're responding to.

Are you saying VZW will be GSM in a year???
Verizon will have a GSM network within the year
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Offline Dan

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Re: cell phone unlocking
« Reply #41 on: August 26, 2010, 01:23:50 PM »
Verizon will have a GSM network within the year
No, they'll have an LTE data network, which is where GSM and CDMA are both heading.
It's technically incorrect to call LTE a GSM network AFAIK.

And they'll still be using CDMA for voice for many more years, although that will go LTE as well eventually.
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Offline Cheap dude

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Re: cell phone unlocking
« Reply #42 on: August 26, 2010, 01:45:15 PM »
If anyone wants a palm centro gsm which could be unlocked very easily ( around 2 bucks on ebay) I have for $69 pm me if interested.

Offline Dan

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Re: cell phone unlocking
« Reply #43 on: August 26, 2010, 01:46:46 PM »
If anyone wants a palm centro gsm which could be unlocked very easily ( around 2 bucks on ebay) I have for $69 pm me if interested.
What condition is it in?
If it's so easy to unlock, maybe you should unlock it yourself and just charge more?
Save your time, I don't answer PM. Post it in the forum and a dedicated DDF'er will get back to you as soon as possible.

Offline Cheap dude

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Re: cell phone unlocking
« Reply #44 on: August 26, 2010, 01:57:40 PM »
I should never got around to it. I have a bunch some in very good condition.