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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 83488 times)

Offline Dr Moose

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Re: cell phone unlocking
« Reply #195 on: January 07, 2015, 11:34:16 PM »
depends on the phone... what phone is it?
LG G3
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Offline sky121

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Re: cell phone unlocking
« Reply #196 on: January 07, 2015, 11:38:37 PM »
LG G3


Have an active plan with Sprint? If so just call and ask them.
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Offline Dr Moose

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Re: cell phone unlocking
« Reply #197 on: January 07, 2015, 11:40:56 PM »

Have an active plan with Sprint? If so just call and ask them.
I have an active account, but the phone has a bad ESN, would that be an issue?
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Re: cell phone unlocking
« Reply #198 on: January 07, 2015, 11:54:50 PM »
I have an active account, but the phone has a bad ESN, would that be an issue?
Yes, I'd imagine so.
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Re: cell phone unlocking
« Reply #199 on: January 08, 2015, 12:03:36 AM »
I have a Sprint device that I would like to unlock for international usage, is it possible to unlock Sprint phones?
IINM being that Sprint is CDMA it can not be used internationally
I wonder what people who type "u" instead of "you" do with all their free time.

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Re: cell phone unlocking
« Reply #200 on: January 08, 2015, 12:13:54 AM »
IINM being that Sprint is CDMA it can not be used internationally

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Re: cell phone unlocking
« Reply #201 on: January 08, 2015, 12:14:31 AM »
I wonder what people who type "u" instead of "you" do with all their free time.

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Re: cell phone unlocking
« Reply #202 on: January 08, 2015, 12:22:42 AM »
Where can it be used?
Most phones today have a Sim card (hence GSM radios) to use intl

Offline yakov116

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Re: cell phone unlocking
« Reply #203 on: January 08, 2015, 12:26:28 AM »
Most phones today have a Sim card (hence GSM radios) to use intl
In other words it works like a radio station, intl works on FM and america works on AM. But both are radio frequencies.

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Re: cell phone unlocking
« Reply #204 on: January 08, 2015, 07:50:16 PM »
Yes, I'd imagine so.
They won't unlock a bad esn

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Re: cell phone unlocking
« Reply #205 on: January 11, 2015, 04:05:38 PM »
Most phones today have a Sim card (hence GSM radios) to use intl
Sprint CSR told me they do not have GSM cards to use internationally.  Are you suggesting there is something built in that allows for Sprint international reception without a physical sim card?

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Re: cell phone unlocking
« Reply #206 on: January 11, 2015, 04:11:13 PM »
Sprint CSR told me they do not have GSM cards to use internationally.  Are you suggesting there is something built in that allows for Sprint international reception without a physical sim card?
there are some phones that are CDMA and GSM compatible not all are
I wonder what people who type "u" instead of "you" do with all their free time.

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Re: cell phone unlocking
« Reply #207 on: January 11, 2015, 04:12:23 PM »
Sprint CSR told me they do not have GSM cards to use internationally.  Are you suggesting there is something built in that allows for Sprint international reception without a physical sim card?

I'm not sure you understand what's going on. Most (if not all) smartphones today, have a SIM card for LTE service. This SIM card can be swapped out for any local SIM card worldwide. (Sprint [once?] blocked non-sprint sim card while in the USA, but if you were in Europe/Israel, you can pop in any local sim card. Verizon is basically the same. (I'm not so particular/up-to-date with the rules here). My Verizon & Sprint are unlocked out of the box.

Another service that they offer, that you can use your phone with the SIM card that you use here in the states, you can use it worldwide and pay them the intl fee, VZW for example has 100MB/$25 - about $1-2 per minute talk etc, not sure about Sprint.

I'm sorry if it wasn't so clear.


ETA: Even on there dumb-phones, they have some intl agreements where you can use as CDMA, like Israel they have(had)with Pelephone, I was charged $.05 for incoming txt, $.50 for outgoing, $2.50 min/talk

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Re: cell phone unlocking
« Reply #208 on: January 11, 2015, 04:12:51 PM »
there are some phones that are CDMA and GSM compatible not all are

Most smartphones nowadays are, not sure about flip phones

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Re: cell phone unlocking
« Reply #209 on: January 11, 2015, 04:42:47 PM »
I'm not sure you understand what's going on. Most (if not all) smartphones today, have a SIM card for LTE service. This SIM card can be swapped out for any local SIM card worldwide. (Sprint [once?] blocked non-sprint sim card while in the USA, but if you were in Europe/Israel, you can pop in any local sim card. Verizon is basically the same. (I'm not so particular/up-to-date with the rules here). My Verizon & Sprint are unlocked out of the box.

Another service that they offer, that you can use your phone with the SIM card that you use here in the states, you can use it worldwide and pay them the intl fee, VZW for example has 100MB/$25 - about $1-2 per minute talk etc, not sure about Sprint.

I'm sorry if it wasn't so clear.


ETA: Even on there dumb-phones, they have some intl agreements where you can use as CDMA, like Israel they have(had)with Pelephone, I was charged $.05 for incoming txt, $.50 for outgoing, $2.50 min/talk
Had no idea that nonSIM card carriers (Sprint and Verizon) can work in Israel if unlocked!  CSRs never told me this.  I don't remember seeing a SIM card slot, though. 

ETA  Ahh.  I am thinking about older nonSmartphone phones.