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I Am very frustrated with this phone....

I bought this phone off Ebay about 3 weeks ago. It was labeled as a d820 The listing said for parts does not read sim card but everything else worked. Being Semi decent in the tinkering world I thought I would spend the 40 $ on the phone to see if I could make it work. When I got the phone it was on the setup screen because it was just factory reset. When I put my sim in (T-mobile) it showed that it had a signal. As soon as finished setup it lost the signal and could not connect again. So obviously it is some kind of software issue. So the first thing I did was try to update it from lollipop to marshmallow. Once again it showed it was connected to my network until completing setup. This time when I was in the bootloader I noticed that it said it was a d821. I figured well I paid 40 dollars I was probably going to get ripped off somewhere. So then I started reading about how to use the d821 in America thinnking that was the issue. I tried the qpst thing where you add the additional bands- nothing. Then I messed around a bunch in the cdma tool after reading a thread about adding cdma to the device. I also tried flashing various modems and roms with no luck. Last night I thought maybe theres something I missed hardware wise in the phone so I opened it up. I checked all of the connections and everything was fine. I started reading the numbers and got really confused. On the back of the phone it says d821 under the lg logo. but on the inside of the back cover and the plastic shroud on the motherboard it says d820. This might be irrelevant but it would be super great if someone had an idea of how I can get this to work on T-mobile in the USA because with a decent rom this phone is wayyy smoother and faster than my 5.5" alcatel idol 3 network unlocked from cricket (So lte sucks). All i want is a phone that has a stable lte connection XD
ANY ideas how to fix my D821?

The model # in the bootloader is the correct model #. Is it possible the imei has been blacklisted?

On the motherboard, near battery connector there is info about 32/16gb and d820/d821.

New provider tactic? Not SIM locked to provider, but SIM locked to device!?

9 months ago I switched providers from NTT docomo (where I still used a SIM lock free iPhone) to SoftBank (where I got a new Pixel 3, and first time in many years that I got a phone + SIM).
But like how the whole nature of planned obsolence works, gradually going from best phone ever to falling apart to boiling my blood.
First the USB-C port of my phone stopped working (so I am now forced to use wireless charging and SFTP on a local network), then the FeliCa chip started becoming instable (which is fine, I can still switch back to a dedicated SUICA card where the FeliCa chip works for a decade), then I was forced to set up a finger print to use Google services (later on turned out to be just a policy issue in Google Apps, I already fixed that) which only makes my phone more insecure (random unlocking if accidentally unlocking the phone within 5 seconds or when the scanner touches the skin of my lag through my pants), but after I turned off finger print authentication my phone started to randomly unlock itself whenever I get extreme weather warnings (and since it's summer, I'm getting multiple times every day).
So I was looking for switching to another phone, and I bought a SoftBank branded Digno flip phone from Amazon, and my SIM card didn't work.
I went to SoftBank have them take a look, the guy was searching using my IMEI for 30 minutes only to tell me that the Digno problem is a very rare case and that Aquos flip phone doesn't have this problem because Digno is too old (released before 2015).
So I bought the Aquos flip phone that he recommended me, but again my SIM card didn't work.
I started to question it, and put my SIM card into my SIM free iPhone: didn't work.
Then I put it in an Aquos smartphone which I bought specifically as a SIM free phone: didn't work.
I went to SoftBank again (this time to a different store because I didn't have much time) and explained the situation.
The guy then told me that I must have my phone registered at SoftBank for the SIM to work.
Then I asked how I can do that, he said that I must purchase a phone via SoftBank instead of Amazon, or otherwise let a totally different SIM card get issued.
By this I'm not complaining or asking to hack the system, I only want to ask if anyone knows about such a tactic? Did anyone experience it too (in Japan or overseas)? And is it normal for a phone provider to lock your SIM card to a specific phone?
And while we're at it: if I flash my phone with a custom ROM, will this render my phone to be unusable with this SIM card as well?

Looks like you are down with a string of strange events and bad luck.
Softbank seems to be a d*ck and I would change a provider if I am you. It is illegal in my country, malaysia, to lock devices to network. But you can easily just register your phone imei to Softbank if you really like the coverage they provide.
As for phones I can't comment on that as I never used pixel, aquos or any of the phones you mentioned but the fingerprint able to unlock by touching your legs through your pants sounds like a hardware failure and I would bring the phone in for repair.
Sent from my SM-N950F using Tapatalk

In my experience Docomo works really well within the Yamanote area of Tokyo, but I cannot afford living there and my work is just outside of that area.
And I already had home internet from SoftBank, which were the 2 reasons why I went with SoftBank, plus its coverage works really well (even when I go to a mountain village north from Sapporo, which I did yesterday, I still have really good coverage).
Their SIM only plans were also really good, I really feel like an idiot that I took a SIM + phone set this time…
My friends (I have them despite my username) also recommended me to go with au, but I didn't like what they covered (can't remember what exactly, but I remember it was somewhere among those lines).
But would be nice if our politicians would make this illegal too, once big companies obtain too much power, it's never going to be enough for them.
Edit:
I only want to add that the only time I had a bad coverage with SoftBank was when watching fireworks at the Edo river, but I'm not sure whether it's because I was near a big river or because the part of the river has a 3 point prefectural border (between Tokyo, Chiba, and Saitama).

yujin-nashi said:
9 months ago I switched providers from NTT docomo (where I still used a SIM lock free iPhone) to SoftBank (where I got a new Pixel 3, and first time in many years that I got a phone + SIM).
But like how the whole nature of planned obsolence works, gradually going from best phone ever to falling apart to boiling my blood.
First the USB-C port of my phone stopped working (so I am now forced to use wireless charging and SFTP on a local network), then the FeliCa chip started becoming instable (which is fine, I can still switch back to a dedicated SUICA card where the FeliCa chip works for a decade), then I was forced to set up a finger print to use Google services (later on turned out to be just a policy issue in Google Apps, I already fixed that) which only makes my phone more insecure (random unlocking if accidentally unlocking the phone within 5 seconds or when the scanner touches the skin of my lag through my pants), but after I turned off finger print authentication my phone started to randomly unlock itself whenever I get extreme weather warnings (and since it's summer, I'm getting multiple times every day).
So I was looking for switching to another phone, and I bought a SoftBank branded Digno flip phone from Amazon, and my SIM card didn't work.
I went to SoftBank have them take a look, the guy was searching using my IMEI for 30 minutes only to tell me that the Digno problem is a very rare case and that Aquos flip phone doesn't have this problem because Digno is too old (released before 2015).
So I bought the Aquos flip phone that he recommended me, but again my SIM card didn't work.
I started to question it, and put my SIM card into my SIM free iPhone: didn't work.
Then I put it in an Aquos smartphone which I bought specifically as a SIM free phone: didn't work.
I went to SoftBank again (this time to a different store because I didn't have much time) and explained the situation.
The guy then told me that I must have my phone registered at SoftBank for the SIM to work.
Then I asked how I can do that, he said that I must purchase a phone via SoftBank instead of Amazon, or otherwise let a totally different SIM card get issued.
By this I'm not complaining or asking to hack the system, I only want to ask if anyone knows about such a tactic? Did anyone experience it too (in Japan or overseas)? And is it normal for a phone provider to lock your SIM card to a specific phone?
And while we're at it: if I flash my phone with a custom ROM, will this render my phone to be unusable with this SIM card as well?
Click to expand...
Click to collapse
It isn't a matter of "locking the device to the SIM", it is a matter of the device being registered on the service providers network using the device's IMEI number and the SIM card number being registered as being used with that device, both of these numbers must be registered together in your service account, that is how the network recognizes your device and how it knows to send service via that SIM to your device. When you switch to another device, the new device must be registered on the network and the SIM must be registered as being used with that device.
It's similar to registering your car and registering a license plate on that car. The car is registered to identify it as your car and the license plate is registered to identify that the license plate is for your car and not someone else's.
Sent from my SM-S767VL using Tapatalk

Droidriven said:
It isn't a matter of "locking the device to the SIM", it is a matter of the device being registered on the service providers network using the device's IMEI number and the SIM card number being registered as being used with that device, both of these numbers must be registered together in your service account, that is how the network recognizes your device and how it knows to send service via that SIM to your device. When you switch to another device, the new device must be registered on the network and the SIM must be registered as being used with that device.
It's similar to registering your car and registering a license plate on that car. The car is registered to identify it as your car and the license plate is registered to identify that the license plate is for your car and not someone else's.
Sent from my SM-S767VL using Tapatalk
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If it's true, then I'll try it out.
Somehow confusing if employees of the same ISP working at different branch stores tell me totally different things. (´；ω；｀)

Note 20 Ultra exynos UK version stuck in HDPSA (H/H+) with no signal

This happened very often, when mobile signal is weak the phone will stuck in HDPSA (H/H+) with no internet and finally lose its entire signal, even later moved to a better signal area. I have missed a lot phone calls / messages when this happens, have 3 different brand new Note 20 ultra replaced by warranty all have this problem. Can confirm this is not network or SIM card related as when swap the SIM back to Note 10 plus it is just working fine as it should be (3 days while waiting for replacement using the same SIM living in the same area). Put the phone into flight mode and turn it back can solve the problem however the difficult thing is you won't know when this will happen and for the price tag, it seems it should be this kind of problem with it.
This issue seems also with S20 release too, for years the issue is still there, anyone have the same issue or can help?
https://eu.community.samsung.com/t5...9_1602387363_c3023d20e4ec11542a67d3cd7a813fdc

shvyue said:
This happened very often, when mobile signal is weak the phone will stuck in HDPSA (H/H+) with no internet and finally lose its entire signal, even later moved to a better signal area. I have missed a lot phone calls / messages when this happens, have 3 different brand new Note 20 ultra replaced by warranty all have this problem. Can confirm this is not network or SIM card related as when swap the SIM back to Note 10 plus it is just working fine as it should be (3 days while waiting for replacement using the same SIM living in the same area). Put the phone into flight mode and turn it back can solve the problem however the difficult thing is you won't know when this will happen and for the price tag, it seems it should be this kind of problem with it.
This issue seems also with S20 release too, for years the issue is still there, anyone have the same issue or can help?
https://eu.community.samsung.com/t5...9_1602387363_c3023d20e4ec11542a67d3cd7a813fdc
Click to expand...
Click to collapse
See if this helps
https://play.google.com/store/apps/details?id=com.ray.samsungbandselection

*Detection* said:
See if this helps
https://play.google.com/store/apps/details?id=com.ray.samsungbandselection
Click to expand...
Click to collapse
Hi Thanks for the recommendation so dose that mean to use this tool to manually force the phone to stay on a certain type of band? (eg not using HSDPA?) . I was thinking this would be fully automatic as it is a basic function of a mobile phone
I've installed and will give it a try next time the signal is lost.

shvyue said:
Hi Thanks for the recommendation so dose that mean to use this tool to manually force the phone to stay on a certain type of band? (eg not using HSDPA?) . I was thinking this would be fully automatic as it is a basic function of a mobile phone
I've installed and will give it a try next time the signal is lost.
Click to expand...
Click to collapse
Yes you can force the phone to use a certain band, and yes the phone should be doing this automatically but you can use this as a workaround and maybe a future update will solve the problem for you

I need help

So I have a Z Fold 2 I bought on ebay. I believe its a Verizon device however the model number is SM-F916U1, and I know Verizon unlocks their devices after 60 days. I've had the phone for about 45 days now. Well whenever I try to use my cricket sim card in it it will register on the network just fine and everything works for about 10 to 15 minutes and then it kicks me off the network and locks it up. Do I need to get my phone unlocked or is there something I'm overlooking? Can someone point me in the right direction I've been Googling the hell out of this and can't find an answer.

I would guess it's a stolen z fold did u check the imei? When I bought my z fold 2, i got an empty box from ups. Had to file a police report and everything. I didn't buy from ebay but best buys. I never had a ups package stolen until this phone so if I were to guess the one u bought off ebay might not be good.

Yes that was the first thing I did its not stolen and jts fully paid off.

I'm completely wrong then. Sorry I'm not sure possibly 60 day thing like u said. Can u try a different sims?

Yeah I've tried different sims and they all work except after 15 to 20 minutes it suddenly kicks me off the networks and says network locked. When I first got the phone I put a Verizon postpaid sim into it hoping it would somehow help but idk. The problem here is I don't know when this phone was originally purchased or if it was ever activated on Verizon before I got it in my hands. Is there any way to maybe find that info out?

Most likely you'd need to contact Verizon to get them to unlock it on their end, however since you weren't the original owner, they might refuse to do it.

I did contact them and they said on their end the phone shows as unlocked.

Pixel 4a 5g NO NETWORK WONT DETECT SIM

I purchased a pixel 4a 5g yesterday secondhand and it turns on and everything works except for the fact that it won't detect the SIM and shows no network in the top right of the screen. It won't allow me to use mobile data at all. Somebody hopefully has repaired this issue before and can advise me what to do?? Thanks

Try doing a factory reset to the phone - maybe the first owner had the phone configured to use an eSIM so it may ignore physical SIM cards.

JohnC said:
Try doing a factory reset to the phone - maybe the first owner had the phone configured to use an eSIM so it may ignore physical SIM cards.
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I've tried the factory reset. Also flashed a couple different firmwares that I downloaded from Google

Just tried flashing Lineage 18 and after a successful flash I still have no sim detected and no data. The guy I bought it off said that his kids may have dropped it in some water but If it was water damage I don't think it would turn on at all. I'm at wits end with the thing.