Sim Network Unlock? - Sony Xperia XZ Premium Questions & Answers

Long story short - my network are playing silly buggers and will not give me the network unlock key for my Xperia XZ Premium. I've tried a third party site also and they had no joy securing it.
All this is making me consider trying to flash/ re-image my handset to remove the network lock. I'm technically very strong (Software/Computer Engineering) but this is my first journey into flashing software onto the XZ premium so need some basic advise to get started. Checking settings suggest that the bootloader cannot be unlocked on my handset and it's not currently rooted.
Some very basic questions to start with :
- Will what I am proposing to do even work? i.e remove the network SIM lock by flashing an appropriate image onto my handset?
- Is it a prerequisite that the handset is rooted and/or bootloader is unlocked before I can proceed with this?
- I read in a few messages about risk of loosing DRM keys / Green Camera issues. etc. What precautions needs to be taken to avoid this?
- Anything else I should consider before proceeding?
Any guidance greatly appreciated.:good:

Related

[Q] Unlocking sim card Hell

Hi there!
I just bought a SE Xperia x8. It was Locked to 3 uk.
I used a unlock online service to unlock it. Did everything right as it was in the unlocking manual. But in the end of the process the software Multi unlocking client frozed. The know the mobile doessn't recognize any sim card.
In the hiden menu the X on the network lock is not there anymore as it was unlocked.
And when I try to connect to a network the message I get is "Your sim card does not allow a connection to this network"
I rooted it changed roms and the problem persists
Can anyone help me?
The Online unlocking service wants me to by more credits and try again....
Have the same problem... any fix for this?
I just opened my own thread for exactly the same thing last night - did either of you have any luck getting this fixed?
Oh God, I remember MultiUnlocker from my Palm Pre days. What a horrid piece of software it is.
I'd recommend contacting their support division and outlining your problem. I was able to gain the necessary three credits to unlock my phone (stupid bloody thing took that many goes).
It may prove problematic that your phone is kinda 'in limbo' ie. showing unlocked but not. You should be able to input a code from the emergency dialler giving you access to the engineering menu, which will allow you to re-lock your phone, then the code should work.
I'll subscribe to the thread in case you need further advice!

[Q] Re-enable sim lock?

I got a sim-locked phone.
On the one hand I want to be able to - at least temporarily - use it on another network.
But I was told by my provider that once I unlock the phone (which I am allowed to), I would loose my warranty.
So: Can I re-enabled a sim-lock (without anyone noticing it was temporarily enabled)?
Since it appears that the sim-lock status is not bound to the ROM just flashing a stock rom will
not enable the sim-lock again.
How can I enable it after it was enabled?
I have a Galaxy Note 2 GT-N7100 and was thinking of using this method: http://forum.xda-developers.com/showthread.php?t=2014982
I figure I put this in the general section since this is still a general question that should be able to be answered applying to all (or at least most) android phones.
Thanx!
I have done it to my wifes GS3
I used the same thread to unlock then reversed it and relocked the sim. I don't believe there is a way anyone could tell it had been toggled off and back on. It is a service menu on the Samsung device.

What are some methods of unlocking an Android phone?

Without getting into technical details, what are the typical methods of unlocking (using your device on another carrier), in particular Samsung Galaxy, Sony Xperia, etc.
I know of a few methods: carrier unlock, online unlocking with a code (requires payment to an unlocking site), rooting and installing a custom rom, and hardware add-on by connecting your device to a peripheral that assists in unlocking.
Many years ago, one could get free random unlocking phones for their dumb phone by simply entering their device's EMI and serial number. Is there another way that isn't mentioned where the consumer can unlock their Android device?
Michael Carleone said:
Without getting into technical details, what are the typical methods of unlocking (using your device on another carrier), in particular Samsung Galaxy, Sony Xperia, etc.
I know of a few methods: carrier unlock, online unlocking with a code (requires payment to an unlocking site), rooting and installing a custom rom, and hardware add-on by connecting your device to a peripheral that assists in unlocking.
Many years ago, one could get free random unlocking phones for their dumb phone by simply entering their device's EMI and serial number. Is there another way that isn't mentioned where the consumer can unlock their Android device?
Click to expand...
Click to collapse
other than calling your carrier and telling them to cough up the code you pretty much covered what i have seen posted around, but im no expert in this area.

Improving security for a rooted phone?

There are many reasons why people need to root their phones. We're glad to have phones like the Pixel 3 with unlockable bootloaders. Google requires that the bootloader remains unlocked to have a rooted phone. A security warning about the unlocked bootloader is displayed every time the phone starts.
In an ideal world, once the phone is configured the way the owner likes (including root), it should be possible to re-lock the bootloader, entering a password required to unlock again, and perform lock and unlock without wiping the phone.
With the current status quo, what steps can the owner take to improve security and reduce the attack surface of a stock but rooted Pixel 3 - from both wireless and app-borne threats, as well as physical threats (e.g stolen phone)?
timg11 said:
There are many reasons why people need to root their phones. We're glad to have phones like the Pixel 3 with unlockable bootloaders. Google requires that the bootloader remains unlocked to have a rooted phone. A security warning about the unlocked bootloader is displayed every time the phone starts.
In an ideal world, once the phone is configured the way the owner likes (including root), it should be possible to re-lock the bootloader, entering a password required to unlock again, and perform lock and unlock without wiping the phone.
With the current status quo, what steps can the owner take to improve security and reduce the attack surface of a stock but rooted Pixel 3 - from both wireless and app-borne threats, as well as physical threats (e.g stolen phone)?
Click to expand...
Click to collapse
Just the usual stuff, use a strong pin or passcode to access the device. And don't side load apps from shady sources.

Does "Unlock the Bootloader"... Unlock the Phone?

Hello, XDA.
I bought a Moto e 2020 Unlocked (Renewed) thru Amazon, and it's apparently Not unlocked.
When powering up, it shows "Xfinity Mobile".
A search in this forum found threads that tell us how to unlock the Bootloader.
Is That what I want? What is the Bootloader?
Will That procedure then make the phone Unlocked, so that I can activate it on RedPocket?
Thanks.
Mark2463
Hi, unlocking your device leads, unfortunately, to the lost of your guarantee once you have a problem with it. So, my advice would be: not unlock it. Kind regards, kuzibri
Thanks for the reply, Kuzibri, but I Think I'm not worried about the Warranty.
This is a Used (refurbished) device.
Will unlocking the "bootloader" allow me to use it with another service provider?
AFAIK, your device is connected to a specific provider and unlocking it does not allow you to choose another provider, but only allows you to downlaod, f.i., apps that are not allowed to be downloaded from the app store or gives you the opportunity to install a different ROM on your device. Kind regards kuzibri
Really?
Unlocking it will Not allow moving service to another provider?
Gee... I thought that's usually the Purpose of unlocking these devices.
As I already said, unlocking a device does not allow you to switch to another provider. The main purpose of unlocking is to download apps that the Store refuses or to install another custom ROM on your device. If you want another provider, you have to switch from your current provider and choose another one, which, in general, also means another SIM card and if you're lucky, the new provider lets you keep your current phone number, otherwise you will get a new one (rather disturbing IMHO). Regards kuzibri
Hello~ if you're looking for a new service provider, then the 'unlock' you're referring to is probably the network lock, which locks your device to certain network provider/s. So i suggest you search in that direction. regards.
Well, Thanks, Fjildeth, for that clarification.
Apparently there IS a Difference between unlocking the Network, and unlocking the Bootloader.
THAT was my original question.
Yes, I want to make this new phone usable on a network other than Xfinity.
So, unlocking the Bootloader will Not do what I want... correct?
Mark2463 said:
Well, Thanks, Fjildeth, for that clarification.
Apparently there IS a Difference between unlocking the Network, and unlocking the Bootloader.
THAT was my original question.
Yes, I want to make this new phone usable on a network other than Xfinity.
So, unlocking the Bootloader will Not do what I want... correct?
Click to expand...
Click to collapse
Yes. unlocking the bootloader is a different matter, and isn't what you're looking for. I suggest you go search for 'SIM lock' topics. there's a lot of guides regarding this. Hope you'll find a way.
If you want to make your new phone usable for a network other than Xfinity, then the solution lies in the SIM card corner. Each SIM card is coupled to a certain provider. If you put your current SIM card in another device, it will still be the Xfinity network and not another provider. Alas, you will need another provider with the accompanying SIM card to switch from network. And indeed: "So, unlocking the Bootloader will Not do what I want... correct?", this is correct.
Yes. Unlocking the bootloader will trigger a factory reset that erases all device settings, user data, third-party applications and associated data from the device's hardware storage.
If your bootloader is unlocked, you will be able to root or flash custom ROMs. But keep in mind that there is a reason why every Android comes with a locked bootloader. While locked, it will only boot the operating system that is on it. This is extremely important for security reasons.
Unlocking your bootloader is not recommended if you don't want to install a custom ROM on your device. Bootloader protects you from various data theft attacks and provides security features.

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