Lumia 640 Unlocking problems - Windows Phone 8 Q&A, Help & Troubleshooting

1) AT&T Lumia 640 GoPhone
I get code from at&t but it does not work. I put in my new zealand sim and turn it on and try unlock code on 10 attempts remaining screen and it says incorrect code then puk required, I then input sim puk then it says sim error.
I also try ##7820# method and it accepts code and padlock is opened but on reboot it is locked again.
2) Cricket USA Lumia 640
I paid for unlock code on eBay and it does not work on 10 attempts screen or ##7820# screen.
If anyone could help with either problem or point me to a guide to hack a registry or whatever I would be very grateful.
Thanks.
P.S. what happened to those little black multi -unlock sim things you could buy back in the days that slid in between your sim and the phone and could fool a phone?
Do they not work in this day and age?
Thanks.

Related

unlocking without a SIM card?!

Hi. I am wondering if anyone can tell me the procedure to unlock my AT&T Tilt without another carrier's SIM card?
I have the unlock code from AT&T, but I do not know the key strokes to bring up the dialogue to enter the unlock code. I do NOT have access to another carrier's SIM card. Can anyone help?
Thanks!
j_sous said:
Hi. I am wondering if anyone can tell me the procedure to unlock my AT&T Tilt without another carrier's SIM card?
I have the unlock code from AT&T, but I do not know the key strokes to bring up the dialogue to enter the unlock code. I do NOT have access to another carrier's SIM card. Can anyone help?
Thanks!
Click to expand...
Click to collapse
Why are you wanting to unlock it without the need for another sim? You can use the phone without a sim card in there so it's not like you have that restriction. Just keep the code on the phone and when you have the need, it's there for you whereever you are.
Or if you're wanting to unlock it to sell it, just include the code with the sale. The buyer is going to know it's an att phone, and as long as you have the code to unlock it, there's no difference. If anything, it makes the phone more "new" than if you turned it on the unlock it and then sell. So depending on how you pitch it, it could be an additional good trait
Borrow the other carrier SIM from your friends or go to T-mobile store to do the test.
I had old line with T-mobile. Did the unlock in 5 sec. After putting the T-mobile SIM it ask for SIM lock code...
you can goto a cell phone store. usually the people would let you use a foreign sim.
another idea would be to buy a tmobile to go phones. not that expensive. and you'd get a backup phone as well depending on which you choose. for example, the nokias are real easy to unlock for free
Thanks alot for your replies.
Actually, yes, it is to sell the phone. So, I assume what I will do is just include the unlock code with the sale. It would be nice if the phone actually had a series of keystrokes that you can enter to in order to bring up the unlock dialogue.

Question about unlocking the g1

I just bought a g1 that is not unlocked, and I wondered if I have to have a tmobile sim card to unlock it.
No, the opposite, you need a sim card from another provider (along with the unlock code) to unlock it.
AndyBroke said:
I just bought a g1 that is not unlocked, and I wondered if I have to have a tmobile sim card to unlock it.
Click to expand...
Click to collapse
In The U.S., i saw you were not, you get the code from T-mobile unlike most other U.S. carriers they give it to you. Then any sim card other than an active T-mobile, even old non-active ones I have used as it just needs something to look against to enter the code. Here is the instructions....
T-Mobile Sim Unlock Request
Sim Unlock Reference: nnnnnnnn
IMEI: nnnnnnnnnnnnnnnn
Unlock Code: nnnnnnnnnnnnnn
Thank you for taking the time to contact T-Mobile. Below you will see the Instructions for unlocking your HTC device.
1. Insert the foreign SIM card
2. Power on the device and the display should read "Please input unlock code"
3. Enter the unlock code and the device should display "Phone is unlocked."
4. Allow the phone to scan the network (or manually click on the antenna icon to do this)
It is very important that the instructions and SIM unlock code are entered correctly as listed. If you receive an error message while performing the instructions do not make any further attempts to unlock the handset. Please be aware that if an excessive amount of incorrect attempts are made, the phone will be permanently locked. You will need to verify the IMEI by pressing *#06# and contact Customer Care for support.
Thank You,
Sim Unlock Department
T-Mobile USA, Inc.
...I forget the time you need to be with them as I have for years....

having problems unlocking the sim on my phone.

I'm not sure if this is the right place to ask this question but it did say general for the htc kaiser.
I've recently acquired a htc kaiser from a friend. I contacted at&t for the unlock code but they gave me the wrong one. By the time I recieved the correct code I could no longer attemt to unlock the phone because there had already been 5 attempts. I have seen on some of the posts here that after 5 attempts the phone is permantly locked. Is there any way to get past this issue? Can i still use the kaiser sim unlocker without bricking the phone?
kurl_187 said:
I'm not sure if this is the right place to ask this question but it did say general for the htc kaiser.
I've recently acquired a htc kaiser from a friend. I contacted at&t for the unlock code but they gave me the wrong one. By the time I recieved the correct code I could no longer attemt to unlock the phone because there had already been 5 attempts. I have seen on some of the posts here that after 5 attempts the phone is permantly locked. Is there any way to get past this issue? Can i still use the kaiser sim unlocker without bricking the phone?
Click to expand...
Click to collapse
If you used your PIN 5 times you will need to enter your PUK code (You should ask AT&T for it, If you didn't get it when you received your sim)
I appologize I wasn't specific enough. My carrier is T-mobile and the phone is from at&t. I trying to unlock the phone so it will recognize my sim. There has been five attempts to unlock it and now it will let me input a code but I can't use the ok button to process the code. The message on the screen says "please wait until timeout is over." I did try using the puk code but it wouldn't let me confirm the code.
I already have the 8 digit unlock code from at&t.

[q] after i network unlocked. It locked back up. Help.

I purchased a used Incredible S and when I purchased an unlock code online I was able to network unlock the phone. 2 days later it failed to read my simcard anymore, did it lock back up? It doesn't give me the option to enter an unlock pin like the first time I unlocked it, so how can I check if the phone is still unlocked? or how can I input my unlock code again if it needs it again? HELP
Also, the sim card still works fine in my old phone so it isnt the sim.

[Q] Strange behaviour of Lumia 928 (asks the SIM PIN code twice)

There's something which goes beyond my understanding so I'm placing my question here if someone would know anything about it.
I purchased an unlocked Lumia 928 about 6 months ago and back then it was running on WP8.0. Been using it within Elisa (FInland) network and it's been good.
Because of Verizon's late updates I installed Developers Preview WP8.1 to it. After the installation the phone started to ask the SIM PIN code twice. After that it thinks for a while and connects me to the network.
OK, about a week ago my phone showed a message that Lumia Denim is now available. So by using Nokia/Lumia Recover tool I tried to downgrade my phone in order to get rid of DP WP8.1. After that Denim was installed. Its version number is 3051.50009.1446.0093.
When I switch my phone on, it'll still ask the SIM PIN code twice and thinks for a while. After a while it connects me to the network.
I tried (once again) to downgrade the phone but it'll only get me to the version 3051.50009.1446.0 which doesn't help me at all. So it won't go further in its downgrade process. And after that it'll still ask the SIM PIN code twice.
OK, last attempt: I made a hard reset. After setting my phone and switching it on for the first time it'll tell me that I don't have a SIM card installed but after that it'll connect me to the network.
Quite strange behaviour and I'd like to get rid of that "asks the SIM PIN code twice" procedure but I just don't know how. It seems the phone is "thinking" itself as a dual SIM phone Plus the MMS messages won't work at all.
So I'd really appreciate if someone would know a way out of this problem, whether it'd be a simple one or flashing the phone with a different SW version etc. Thanks a lot in advance!
Perhaps the second code is the code lock the Smartphone
No it's not.
When the phone asks for the SIM PIN code for the first time, it's real. I won't get any further if I don't enter the correct SIM PIN code there.
When the phone asks for the SIM PIN code for the second time, it's a fake. I can enter there a random four digit PIN code and the phone will accept it. Strange indeed.
I'd like to ask two additional questions and I'd very much appreciate if someone could answer them:
1) how to get rid of Lumia 928's MMS message issue? It's not capable of sending & receiving any MMS messages,
2) how to revert Lumia 928 back to its "from the box settings", i.e. WP8.0? Is there an unofficial way of flashing the phone etc.???
Thanks a lot in advance.
did you ask here http://forum.xda-developers.com/showthread.php?t=2515453
maybe you can use that to roll back to 8.0

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