Tried asking this elsewhere but got no response, because I'm currently stuck in CSC hell with my TMB S21 trying to take it to an AT&T MVNO. I tried everything before falling back to SamKey (flashing whatever firmware I could find...all U1 firmwares "debrand" the device but only T-Mo bands are available. Flashing any U firmware, no matter the carrier always shows the T-Mo boot screen and such). I ended up caving and buying a SamKey credit (and changed the CSC to XAA, which worked wonderfully and allowed my S21 use of B29/B30/N5 and some others). However, my primary carrier is still T-Mo and I also used this S21 to keep track of their 5G deployments in my area.
aaand my curiosity got the better of me and I decided to pop my spare T-Mo SIM back into the S21. It did the thing older Samsung phones would do (reboot to reconfigure carrier settings) and unfortunately this blew away everything I did with SamKey and locked the CSCs back to TMB/TMB/TMB. (As opposed to XAA/XAA/TMB)
So, my question for this: Is this intended behavior for Samkey's CSC change to undo itself if the original carrier's SIM is inserted? Because I did screw up one small detail using SamKey, and that was removing the (AT&T) SIM before putting the CSC change through. Not sure if that affects it. Would like to know before I attempt to repeat the process.
Thanks in advance.
Related
So I learned the hard way that you can't have it all.
I travel for work quite a bit and I was in the Middle East working when my Verizon S7 Edge started to have problems. I looked for a replacement in Dubai and was happy to find the S9+ at a reasonable price and with the 256GB option (which I wasn't finding in the US). I popped in my Verizon sim and life was good.
Then I returned to the US and. nothing. worked. I had forgotten that Verizon was strictly CDMA in the US and this phone had no CDMA radio.
I also was noticing that the samsung pay app was locked to the UAE version which was annoying but not a huge issue...I couldn't add American Express credit card which may or may not have been due to that region setting.
So in order to actually get service I switched to T-Mobile and have had decent data rates. However the phone doesn't use volte or wifi calling which is very bad since where I am staying is somewhat of a dead spot for mobile coverage. I basically can't receive phone calls here and making a call requires me to wait about a minute for the phone to figure out what protocol to connect to (dowleveling to either a 3g or H to actually connect and dial).
My initial research tells me that I don't want to root the phone and lose all ability to use samsung pay, but I would love to do as much as I can to the phone to get it working as best as possible.
Can someone chime in here to let me know what's possible? I don't want to experiment too much, and it's been rare over the years for me to keep up with all the root/firmware/rom etc. that has become available. My last real era of rooting phones was many years ago with iPhone and even then it was a lot to keep up with.
thanks in advance!
bump.
Anyone?
I had the same issue. I ended up rooting to get TMobile volte/wifi-calling. Also, by rooting you can also use Verizon Wireless; however, only with LTE.
You could use Google Pay lol.
Furthermore, I suck at giving reasons, but that's what I did.
Don't quote me on this, but from what I understand, you can use the patched ODIN and flash the firmware's CSC outside of it's region and change it to XAA. There is also a guide to changing CSC without root that may work as well.
From what I understand, the G965F is unable to load the XAA csc without root since it is only for the Snapdragon version
I ended up using Tekhd's tmobile detonator after I bricked my G965F/DS atleast 3 times. It works great now.
The way to change csc without root is via a combination rom and using Realterm. Using TMB CSC on a global G965F/DS ROM will end up in a PUK code lock. I tried ALL the US CSC on my G965F to confirm this.
I have flashed T-mobile firmware onto my ATT Galaxy s9+, but AT&T Logo still shows on boot, and the Service provider SW Version still shows AT&T also.
It appears I used the correct firmware, do you guys know how to fix this issue?
I would like to fix it and also make sure i receive all the T-mobil OTA updates.
Thanks.. AT&T Sucks!
tm303 said:
I have flashed T-mobile firmware onto my ATT Galaxy s9+, but AT&T Logo still shows on boot, and the Service provider SW Version still shows AT&T also.
It appears I used the correct firmware, do you guys know how to fix this issue?
I would like to fix it and also make sure i receive all the T-mobil OTA updates.
Thanks.. AT&T Sucks!
Click to expand...
Click to collapse
Don't quote me on this, I'm sure I'm totally wrong, not really familiar to Samsung and the way carriers handle CSC switching. I don't think you can just switch carriers by flashing a different firmware when it comes to the US variants. I know all the other carriers can change their home CSC. If it were that easy why wouldn't there be guides or more people doing it? I recently found this out like you did when I flashed TMobile firmware to my Sprint S9+ and still ended up getting SPR/SPR/SPR. I'm assuming it assigns your service and stuff by IMEI?? I'm probably wrong to some extent but I really doubt it's possible to do that otherwise carrier locking devices would be basically pointless. Now if we could root our devices and get off of Samsung's locked down bootloaders we could probably dismiss their carrier integration that makes it to where it auto assigns us the service for the phone based on whether we are UUIC unlocked. Sorry mate. I even tried going from sprint 965u to unbranded 965u1 then to tmobile 965u still no luck.
TLDR: I just tried it too, don't think it's as simple as flashing that carrier specific firmware. They lock it down so you can't just take their device and leave their plan. They want their money.
I have an S21 that I purchased from Sprint. When using on Sprint the startup splash screen was yellow with the Sprint logo and when I switched to a T-Mobile sim card the splash screen was updated to magenta with the T-Mobile logo. Now that I've moved to Verizon the splash screen hasn't changed. Any way to update it? Also, since moving to Verizon I have lost the setting for wifi calling to be enabled. Is there a way to get that back?
Okay, so some extra searching told me that apparently my CSC wasn't updated from TMB to VZW when I switched my sim card. Unsure whose fault that is, but is there a way to update it without paying for SamKey? Is there any actual benefit to updating from TMB to VZW, or am I wasting my time?
Mustang46L said:
Okay, so some extra searching told me that apparently my CSC wasn't updated from TMB to VZW when I switched my sim card. Unsure whose fault that is, but is there a way to update it without paying for SamKey? Is there any actual benefit to updating from TMB to VZW, or am I wasting my time?
Click to expand...
Click to collapse
Hi
Regarding changing CSC without paying , maybe if you are lucky you could try the dialer method , check here also read this thread , if this do not work SamKey may be your last option( without rooting)
Regarding the benefits of changing CSC.... in your case i do not know
MAX 404 said:
Hi
Regarding changing CSC without paying , maybe if you are lucky you could try the dialer method , check here also read this thread , if this do not work SamKey may be your last option( without rooting)
Regarding the benefits of changing CSC.... in your case i do not know
Click to expand...
Click to collapse
Thanks, I did try the dialer option already, no dice.
Just thought I'd update this to let everyone know that I go the update to Android 12 today, and when the update finished my phone realized it had a Verizon sim card and the CSC was finally updated!
It's a small win, but I'll take it.
Greetings,
Just purchased Unlocked S22+ from Samsung US. The phone model is SM-S906U1UES2AVI5.
My service is with AT&T.
My CSC status shows the following:
SM-S906U1_OYM_ATT_13_0012
ATT/ATT,XAA/XAA
My questions are:
Are the first two ATT/ATT a result of the phone recognizing AT&T Sim card?
What do the XAA/XAA mean?
If I insert another provider's SIM (US T-Mobile for example, or UK Vodafon, or you-name-it), will my phone still work? It is supposed to be Unlocked. I have an International Version S21+ and the provider/SIM info is not shown like this.
Thank you.
Anyone?
Your currently applied CSC is ATT, then 2 sim slots: ATT and another one probably empty. Eventually the original device CSC, which is USA/Unlocked.
Basically your device us unlocked for the US market, because you've out an ATT sim inside, it got an ATT CSC.
You can put whatever sim you want.
DubelBoom said:
Your currently applied CSC is ATT, then 2 sim slots: ATT and another one probably empty. Eventually the original device CSC, which is USA/Unlocked.
Basically your device us unlocked for the US market, because you've out an ATT sim inside, it got an ATT CSC.
You can put whatever sim you want.
Click to expand...
Click to collapse
Thanks @DubelBoom .
So if I just put another provider's SIM (T-mobile for example), the first two will change to TMO.
I believe it is unlocked for all markets, not just US/
What is the meaning of the 3rd/4th CSC (XAA/XAA)?
This phone has one physical SIM Slot and any other SIM will be eSim.
Man search up on Google how csc is written, you'll find it all. Basically it's current CSC / sim1, sim2 / csc of what it was manufactured for.
The last one cannot be changed, the others can, with different methods.
XAA is us unlocked meaning this device was manufactured for the US market with no specific carrier. Has nothing to do with sim lock, it has mostly to do with software updates.
DubelBoom said:
Man search up on Google how csc is written, you'll find it all. Basically it's current CSC / sim1, sim2 / csc of what it was manufactured for.
The last one cannot be changed, the others can, with different methods.
XAA is us unlocked meaning this device was manufactured for the US market with no specific carrier. Has nothing to do with sim lock, it has mostly to do with software updates.
Click to expand...
Click to collapse
I seearched, it is unclear to me in this case.
So the first one (Current CSC) - will this change as well if I use another carrier (not AT&T)?
Am I getting AT&T updates (because of the first one) or am I getting Samsung updates because it is an unlocked/unbranded phone? This is what confuses me.
I want to make sure that I can put whichever SIM that I want and the phone will work "out of the box".
Thank you.
[email protected] said:
che
check it out *spam link remove" edit by blackhawk
Click to expand...
Click to collapse
Squished bs, from their website:
"How long will it take for my Cow Squishmallow to be delivered?
We are using the fastest logistics companies out there who are going to deliver these beautiful squishmallows to your doorstep in 15-21 business days.
Is the Cow Squishmallow a unisex toy?
The toy is suitable for both genders to play with. Not only this, but the babies also take a keen interest in playing with the cow squishmallows. So, when you grab a couple of these toys all of your children can share them."
From China with wuv...
The last part will never change and will always show what the original configuration was. If it was purchased as US unlocked, it will show XAA, if Verizon, VZW, etc. The first two will change simply by inserting another carrier's SIM card. The third is how it was registered when it received the last software update.
I just bought a lightly used so-called "factory unlocked" S21. Everything seems to work just fine (Email, Texts, Phone calls, Internet). But it's exhibiting one weird issue I've noticed. When notifications are all clear it displays "Sprint" in the upper left corner as the network. In addition to that if I go into Settings in various areas I see "Sprint". CSC codes are showing as SPR/SPR/TMB which is Sprint and T-mobile. I'll post all the screen captures.
Just as some background info, after a Safeswitch transfer, all I did was swap out the sim from an old locked S7 Verizon phone to the newer unlocked S21. I don't think using the old SIM has anything to do with displaying Sprint since it's Verizon sim. My theory is that the vendor unlocked it but didn't flash the firmware to the generic unlocked version. It still has the Sprint firmware. Verizon is sending me a new SIM which I can try but I'm not optimistic that it's a SIM issue. I have not done a factory reset because I thought the vendor sent it already reset. I'm not optimistic this would reset the "Sprint" issue either. My question is should I keep the phone or return it? It was only $299 and works perfectly. I just get a little annoyed that they sold it as "factory unlocked" but is shows "Sprint" on the home screen and it appears all over the phones Settings menus. There was a theory that Android 10 had a bug in it that caused this but I'm not sure this is the cause.
Below is a related thread and how I found out about this forum.
Verizon phone shows "Sprint" as provider?
Hi, I have Verizon and after updating to Android 10 today (official Verizon OTA update), when I check the SIM status it will sometimes say "Sprint". It'll also sometimes say "Sprint" when I swipe down from top and look in upper right hand corner...
forum.xda-developers.com
Your phone is originally T-Mobile based on the sales code you provided. You can change it to either Verizon CSC or U1 Firmware. Meaning, you would need to flash the phone, or get access to certain tools that let you simply change the CSC. If flashed to U1, the device would restart based on the inserted SIM and load all necessary firmware for proper connection, but no bloatware.
What is your desired goal? Verizon firmware, or Samsung unlocked firmware?
Thanks for the reply. I really learned a lot buying this phone and did tons of research on it. What I ended up deciding was to just keep the firmware as Sprint/T-Mobile. It does everything so well and the only sign of Sprint is the network name at the top right notification area. It doesn't bother me anymore. I had a bit of an issue with the eBay vendor saying it was factory unlocked when it doesn't have the Samsung factory firmware on it, showing Sprint whenever I have a connection to Verizon's network. But the price was really good and the phone is so nice, battery life is great. Since the phone is all setup and working great I'm just going to leave it. I did quite a bit of customization on the phone already and I'd lose some of that if I loaded new firmware.
It seems like a symptom of the Sprint/T-Mobile firmware is the eSim is not available. That was a nice surprise. This whole purchasing an unlocked phone thing has been quite the enigma. This is why I hate switching phones and I consider myself pretty tech savvy. What a mess. Then Verizon screwed up the new sim so the phone wouldn't call or text. All so they could force me into a newer more expensive plan. Crooks. So I tried to change over to Mint Mobil using the eSim option. The eSim was likely disabled in the firmware so that was impossible. Also Verizon wouldn't let them port my number without a special pin. Which I couldn't receive because Verizon botched my sim and I couldn't get the text from Verizon with the new pin. Disaster.