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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 40752 times)

Offline yakov116

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Re: cell phone unlocking
« Reply #555 on: September 13, 2017, 12:55:13 PM »
Yes, maybe on Verizon but NOT sprint

ETA: both will not activate since it's missing a CDMA band

-1 Not the iPhone 6
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Offline Myccrabbi

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Re: cell phone unlocking
« Reply #556 on: September 13, 2017, 01:41:01 PM »
-1 Not the iPhone 6
Do you have proof for that -1?
I work with phones ya know...
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Offline yakov116

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Re: cell phone unlocking
« Reply #557 on: September 14, 2017, 10:59:54 AM »
Do you have proof for that -1?
I work with phones ya know...
I know it will work from exp. Just may not have the best service. I think only LTE will work on it.

Its not ordeal but it will technically work. Not if it was an apple direct unlocked, then it should work fine on both.
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Offline Myccrabbi

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Re: cell phone unlocking
« Reply #558 on: September 14, 2017, 11:22:37 AM »
I know it will work from exp. Just may not have the best service. I think only LTE will work on it.

Its not ordeal but it will technically work. Not if it was an apple direct unlocked, then it should work fine on both.
Explain to me how it can a GSM band be activated on a CDMA band?
If you can't initially activate it on CDMA it will not work even on the added GSM band since you need the primary band which is again CDMA which AT&T does NOT come with.

I'm just asking for explanation because the knowledge would help me, it's not that I don't trust you but I need facts.
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Offline yakov116

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Re: cell phone unlocking
« Reply #559 on: September 14, 2017, 11:33:31 AM »
Explain to me how it can a GSM band be activated on a CDMA band?
If you can't initially activate it on CDMA it will not work even on the added GSM band since you need the primary band which is again CDMA which AT&T does NOT come with.

I'm just asking for explanation because the knowledge would help me, it's not that I don't trust you but I need facts.

First of all all iphones for verizon since the Iphone 5 CANNOT be activated using CDMA. Actually any phone that can use LTE (a sim in verizons case) will only activate using LTE.
I don't know how many phones you have activated but i am over 500 by now.

That being said, there are standard bands that are used on LTE, if the iPhone (we not talking about android) was made specifically for at&t then it should work on some LTE bands of verizon. They will NOT work if there is only CDMA.
If it was bought directly from apple it should work on all networks (except for sprint) without any issues.

As I said before this whole game it just about over as ALL the new phones are made will all the band's. So they will be able to go from one to the next.

There are some older android phones that will do this too. For example the nexus phones.

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Re: cell phone unlocking
« Reply #560 on: September 14, 2017, 03:51:32 PM »
I bought a unlocked galaxy S6 that was supposed to work on verizon TMobile
I set up TMobile access access point name and web is working perfect
but talk doesn't work comes up error "sim card is not from verizon"
any help?

Offline yakov116

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Re: cell phone unlocking
« Reply #561 on: September 14, 2017, 04:08:41 PM »
I bought a unlocked galaxy S6 that was supposed to work on verizon TMobile
I set up TMobile access access point name and web is working perfect
but talk doesn't work comes up error "sim card is not from verizon"
any help?
Does it work? It will always say that
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Offline shulemw

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Re: cell phone unlocking
« Reply #562 on: September 14, 2017, 09:23:58 PM »
it works but calls not. all else works

Offline Myccrabbi

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Re: cell phone unlocking
« Reply #563 on: September 20, 2017, 11:32:40 AM »
First of all all iphones for verizon since the Iphone 5 CANNOT be activated using CDMA. Actually any phone that can use LTE (a sim in verizons case) will only activate using LTE.
I don't know how many phones you have activated but i am over 500 by now.

That being said, there are standard bands that are used on LTE, if the iPhone (we not talking about android) was made specifically for at&t then it should work on some LTE bands of verizon. They will NOT work if there is only CDMA.
If it was bought directly from apple it should work on all networks (except for sprint) without any issues.

As I said before this whole game it just about over as ALL the new phones are made will all the band's. So they will be able to go from one to the next.

There are some older android phones that will do this too. For example the nexus phones.
I hear but either way it will not work on sprint.
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Offline yakov116

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Re: cell phone unlocking
« Reply #564 on: September 23, 2017, 04:18:25 PM »
I hear but either way it will not work on sprint.
!?! Explain
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Re: cell phone unlocking
« Reply #565 on: September 23, 2017, 08:54:41 PM »
!?! Explain
You said you only know of a exception with Verizon on SOME bands, so I take it it that sprint is NOT guaranteed on any bands.

Either way I think @Sam wanted to know if his at&t IPhone can be unlocked and used regularly on sprint and the answer afaik is no, even if you will find some types of bands it is not guaranteed to work properly
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Re: cell phone unlocking
« Reply #566 on: October 03, 2017, 02:38:45 PM »
I'm trying to unlock a Galaxy Express 3 At&t 4G LTE SM-J120A.

I tried with the att.com/unlock site but they're asking for a pin

Please help!

Offline DanH

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Re: cell phone unlocking
« Reply #567 on: October 09, 2017, 02:39:34 PM »
I'm trying to unlock a Galaxy Express 3 At&t 4G LTE SM-J120A.

I tried with the att.com/unlock site but they're asking for a pin

Please help!
I've used this guy once, worked great:

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