What changes on phone when SIM unlocked ? - Android Q&A, Help & Troubleshooting

Hi Forum. May be my first post. I just SIM unlocked LG V10 on T-Mobile. Here is what I can say about the process that might be helpful to others:
1-Phones can be SIM locked by manufacturers so that service providers ensure that phones can only be used on their network or certain countries. See https://en.wikipedia.org/wiki/SIM_lock for more information.
2-The process of unlocking requires the service provider to request unlock codes from the manufacturer. The service provider may have requirements to unlock ( e.g. in my case I had to put $100 balance on T-Mobile prepaid card ). This process took 5 working days at which time T-Mobile emailed me to inform me that they were ready for me to initiate unlock on my device.
3-On my device, I ran a "Device Unlock" app which connected with somebody ( T-Mobile ? ) and verified my phone was actually unlock eligible and viola. I'm SIM unlocked.
What I would like to know is what has changed on my phone ( e.g. firmware, some information on some partition ) ? Does this mean I can now root, change ROMs and my phone will remain SIM unlocked ? Any links to information about what actually happens when device unlocked would be appreciated.
slomo2

What I can tell you is that, if you did unlock permanent it is going to be unlocked even after rooting and installing new roms etc.
Now, I want to ask in this forum if the phone can be unlocked if the t-mobile unlock app says it is not eligible to unlock. I bought my phone on eBay, called t-mobile the phone is clean, but they could not unlock it for me because needs an account... So now I'm stuck trying to find a 3rd party unlock website to do it, 2 already said they could not... So I have the phone but can't use it. Any suggestions?

Yes, I can confirm that on this LG V10 having performed a SIM unlock and then having switched ROMs the unlock remained in effect.

Related

unlocking h901 t mobile?

yeah, it uses the device unlock app.no it says i'm not eligible for unlock.the seller who sold it to me even requested tmo and was denied.tried rooting and messing with system files now it says can't connect to remote server even after reflashing stock using LGUP.Tried using the f600l rom port, no you can't get the sim unlock prompt to pop up.tried blisspop and resurrection roms, they do prompt for a sim code but the codes do not work it says 255 retries remaining<<<something not right there.I do have the right unlock codes, just get them from an unlocking site or ebay.Speaking of unlocking sites, they want 60usd+ to unlock the tmo variant WTF!! Also if you try to get into the sim unlock menu using stock rom (dial 2945#*901#) it just says device permanently locked for everything.Now if there was a way to get a stock rom or port from say at&t variant which has the sim unlock prompt it just might work.
The closest i've got to unlocking this thing i the actual network unlock screen that comes after you flash the stock firmwire through LGUP. it said 0/30 attempts or something for a brief second or two the first boot after reflashing and then it restarts before you can even do anything into os never to be seen again unless you reflash it again but again you will only see it for a second and its gone again.I wonder if there is a way to keep that screen on so you can attempt to unlock it via code.
Also I'm pretty sure the device unlock app is just there to check prerequisites of your t mo account.In reality it does unlock the same way as other phones.probably just applies unlock code from tmo database once it checks you've met the criteria for unlock.
t-mo has really locked these down .
So has anyone been able to successfully unlock this phone without the tmo app? or have a cheaper service to unlock this thing ? Else im stuck with a paperweight.

Att s9+ flashing to T-Mobile

Hey guys. I just ordered my s9+ (att model) specifically with the intention of flashing TMobile firmware for use on their Network. I chose the att version because it was on sale for $200 off, and since I'm gonna trade in my s7 I'm getting $200 for that and i got the phone for $400 off so i couldn't pass it up.
My question is, not having an att sim, and no plans to activate in their Network, would i need to acquire a sim unlock first, either from att or 3rd party, and would flashing the T-Mobile firmware undo the lock or is the sim unlock not even required?
Phone is paid for from Samsung.com so nothing owed and is brand new. I don't know what att requirements are but i could buy an unlock pretty much anywhere. But if it is needed first, would i need just a sim unlock or a complete device unlock? And do i need to do the sim unlock before flashing another carrier firmware for it to work?
All info helps. Thanks!
Flashing the firmware is just another method of unlocking your phone. As far as I know, it will be useless to unlock the phone before flashing (however, I am not 100% sure).
RossTeagan said:
Flashing the firmware is just another method of unlocking your phone. As far as I know, it will be useless to unlock the phone before flashing (however, I am not 100% sure).
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Was told that sim unlock was at network level and had nothing to do with the Rom. So flashing wouldn't unlock it from the previous carrier. I flashed my s7 from Verizon to T-Mobile but it was previously sim unlocked. It worked like a charm and appears to be network locked to them. Device unlock all doesn't nothing and actually fails lol. Don't have another sim to test though. I'll play it safe and unlock first for the s9.

Question Ihave OP N200 TMobile iwant to unlock it

Hi friends
Ihave OnePlus Nord n200 5G TMobile
Any solution to unlock Carrier
Thank you
takieddinelouifi said:
Hi friends
Ihave OnePlus Nord n200 5G TMobile
Any solution to unlock Carrier
Thank you
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Did you already check this thread but observe the requirements stated in its OP?
[CLOSED][T-Mobile USA] Free SIM Unlocking Service - [OnePlus/Samsung/Google/LG/Moto]
Hello XDA, I am back at it again with the free T-Mobile network unlocks. Yep, you heard that right... 100% FREE. This service will allow you to go into your Settings and perform a network unlock. I've been doing this for over 3 years now with...
forum.xda-developers.com
Oswald Boelcke said:
Did you already check this thread but observe the requirements stated in its OP?
[CLOSED][T-Mobile USA] Free SIM Unlocking Service - [OnePlus/Samsung/Google/LG/Moto]
Hello XDA, I am back at it again with the free T-Mobile network unlocks. Yep, you heard that right... 100% FREE. This service will allow you to go into your Settings and perform a network unlock. I've been doing this for over 3 years now with...
forum.xda-developers.com
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Click to collapse
Thank you. I will go to it... But I don't know if it will work for me.. So I want a way to change the ROM unlock Bootloader or something.
The Quest for a Bootloader Unlock (partial guide, T-Mobile variant, may work for MetroPCS/Metro variant)
OK, this process has been hell, but I'm gonna try and consolidate everything I've worked out so far in one place. This all applies only to the T-Mobile variant (ie. it comes preloaded with all the T-Mobile bloatware) of the N200 on the T-Mobile...
forum.xda-developers.com
Asides from the SIM Unlock service, there's also an unbloat script that will enable OEM/Bootlloader Unlocking without SIM Unlocking your phone (your phone will still be SIM locked, but you'll be able to bootloader unlock it). It's linked to in the thread I linked to.
For the actual Bootloader unlock, you'll need to get a bootloader unlock token from OnePlus. Again, the thread I linked to explains how to do so.
edale1 said:
The Quest for a Bootloader Unlock (partial guide, T-Mobile variant, may work for MetroPCS/Metro variant)
OK, this process has been hell, but I'm gonna try and consolidate everything I've worked out so far in one place. This all applies only to the T-Mobile variant (ie. it comes preloaded with all the T-Mobile bloatware) of the N200 on the T-Mobile...
forum.xda-developers.com
Asides from the SIM Unlock service, there's also an unbloat script that will enable OEM/Bootlloader Unlocking without SIM Unlocking your phone (your phone will still be SIM locked, but you'll be able to bootloader unlock it). It's linked to in the thread I linked to.
For the actual Bootloader unlock, you'll need to get a bootloader unlock token from OnePlus. Again, the thread I linked to explains how to do so.
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Well thank you my friend. Is it possible to unlock it and operate all networks?
takieddinelouifi said:
Well thank you my friend. Is it possible to unlock it and operate all networks?
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The debloat script will NOT SIM Unlock your phone, you will still be locked to a T-Mobile SIM card, but it will enable the Unlock OEM option in the developer options.
To actually SIM Unlock your phone, which will enable other networks, your best bet is mobbdeep's SIM Unlock service.
I'm not sure the SIM Unlock service will work if you've run the debloat script. (a factory restore will re-enable everything the debloater disables)
Hi and excuse of all my stupid queries as I am as an infant when comes to these techy things,
Bought an OP n200 and its locked On T-Mobile, read all this mobbdeep's unlock service in back dates, thread shows closed, and I dont even know how to PM here on XDA. Is there someone willing to help from scratch ?
Any kind of help will be much much appreciated
@Nikka.
It looks like mobbdeep is not doing unlocks at this time. His recent activity doesn't show any. So little point in trying to PM him.
If you haven't already, take a look at T-mobile's unlock policy. Or if you have the Metro-by-T-mobile version, their unlock policy.
Iirc some people have had luck messaging T-mobile on twitter, particularly if they've been a longtime customer.
If your goal is just to get bootloader unlock to be able to install Lineage or other ROMs then you may be able get that option using the debloat script here ("adb shell pm uninstall --user 0 com.qualcomm.qti.uim" is that part that does it). The phone will still be SIM locked / carrier locked though.
blueberry.sky said:
@Nikka.
It looks like mobbdeep is not doing unlocks at this time. His recent activity doesn't show any. So little point in trying to PM him.
If you haven't already, take a look at T-mobile's unlock policy. Or if you have Metro-by-T-mobile version, their unlock policy.
Iirc some people have had luck messaging T-mobile on twitter, particularly if they've been a longtime customer.
If your goal is just to get bootloader unlock to be able to install Lineage or other ROMs then you may be able get that option using the debloat script here ("adb shell pm uninstall --user 0 com.qualcomm.qti.uim" is that part that does it)
Click to expand...
Click to collapse
Thank you for responding, Yes i see that mobbdeep is not active still tried a luck if anyone came up with a solution,
The variant i can only see T- Mobile first logo on start, rest difficult for me to know
And the twitter and FB options i read about is for those with T-Mobile account and their Number current being use in the USA
I am from Asia not having number nor the account at T-Mobile, even the default device unlock app not pre-installed, though i checked my IMEI online on T-Mobile web and they say its CLEAN
Completely have no idea what to do, My goal is to unlock network for now and my oem in developer option is visible to toggle on, that means I am allowed to unlock bootloader but thats not my need for now
Written almost all i knew, any help will be treasured.
@Nikka.
I don't think there are any great options. Such as a diy network unlock method or a free service.
There are paid services that claim to provide a network unlock, but I don't know how trustworthy they are. I've never used one, they were too expensive imho when I last looked. And people on xda don't seem to think highly of them.
If you can, the best option might be to return your n200 and buy a networked unlocked one.

General Why must device be SIM Unlocked for bootloader unlocking?

This is regarding unlocking bootloader on T-Mobile varient. There are two observations.
1) After device is SIM unlocked modification of the setting that was greyed out, 'OEM Unlocking' will be possible..​2) Without device being SIM unlocked, modification of same setting is possible by performing the ADB command ("adb shell pm uninstall --user 0 com.qualcomm.qti.uim")​​Surely the manufacturer wouldn't make SIM unlocking as easy as performing a simple ADB command. But if not, wouldn't that imply that it is, in fact, NOT necessary for device to be SIM Unlocked to Unlock bootloader? It Don't make any sense.
Has anyone tried to unlock bootloader on SIM Locked device and did it work? what happened?
I took my SIM Locked T-Mobile N200 that I never paid a single month for and that was blacklisted and account sent off to collections.
I did ADB command to enable OEM Unlocking. Went to FASTBOOT and acquired the unlocking key. I sent key to ONEplus via their T-Mobile Unlocking webpage. And Oneplus responded a week later with my unlock_code.bin file.. DEVICE UNLOCKED
So I guess this would imply that ability to modify the greyed out OEM unlocking is the only way to unlock bootloader and NOT that 'device must SIM Unlocked' as instructed in the unlocking process.. Device being SIM unlocked is simply just ONE method of allowing modification of that setting? Right??
If you use the adb command and send your IMEI through the device unlock portal on OnePlus.com, you can be bootloader unlocked without being sim unlocked.
It just seems too easy for a T-Mobile locked Contract phone to be unlocked, don't they check the Device against some sort of database or something before providing you the unlock_code.bin??
alienG0D said:
It just seems too easy for a T-Mobile locked Contract phone to be unlocked, don't they check the Device against some sort of database or something before providing you the unlock_code.bin??
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Nope, mine is still on bill credits.
alienG0D said:
It just seems too easy for a T-Mobile locked Contract phone to be unlocked, don't they check the Device against some sort of database or something before providing you the unlock_code.bin??
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The unlock_code.bin file lets you bootloader unlock the phone. This does NOT SIM/network unlock your phone... Though with T-Mobile you're supposed to be SIM unlocked before you can bootloader unlock, we just figured out how to bypass that.
They just linked the SIM unlock to the same thing we've been using, is my guess. I'd be interested to know if I'm right, but at this point, it's moot.
SIM UNLOCKED (bought in September/2021)
It got sim-unlocked after 180day, by simply pressing "unlock permanently" without using Metro or T-Mobile sim ever. after 180day however the phone is seems out of time (outdated).

Question Is it possible to unlock Metro by Tmobile Variant Nord N20?

Usually it will automatically unlock after 180 days, but I am wondering if it can be done faster?
what exactly are you trying to unlock? the SIM unlock i think has to be requested through the carrier or possibly a business that specifically does those but i cant recommend any or the use of those services. bootloader unlock on the tmobile variant(which should be the exact same device, the tmobile variant has the metro apps installed but disabled" was already available in the first security patch...... but i ran the Nord debloat script from another oneplus thread before ever attempting the bootloader unlock the first time so i cant verify whether thats even needed to get the oem unlock option available or not. maybe someone else can comment on that
my device is MetroPCS, hasn't been 180 days and anyone should be able to unlock the bootloader on these carrier devices. and as stated above, sim unlock and bootloader unlock are two different things. you will not be able to force a sim unlock, and the bootloader unlock will not expedite the process either.
pay off your device or search the forums for someone who might just be able to help you, if you fall within their guidelines.
dmtec said:
my device is MetroPCS, hasn't been 180 days and anyone should be able to unlock the bootloader on these carrier devices. and as stated above, sim unlock and bootloader unlock are two different things. you will not be able to force a sim unlock, and the bootloader unlock will not expedite the process either.
pay off your device or search the forums for someone who might just be able to help you, if you fall within their guidelines.
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I just received token. Can I update the system before unlock bootloader?
update: bootloader unlocked after system update.
AmazingZ said:
I just received token. Can I update the system before unlock bootloader?
update: bootloader unlocked after system update.
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yes and take a full backup while u r pulling ur boot image to root
What's the procedure to sim unlock I am currently in India and can't use local sim any help will be appreciated
only way i know of right now is to use the carrier app or possibly pay a 3rd party that does sim unlocks and i honestly dont know any i could recommend. If anyone 3lse has found a way to do this it would b nice to know

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