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What exactly is the point of SIM Unlocking?

I was just wondering what the point of doing this is? Like is it just so I could use like the Verizon CDMA network or what?
I have the Sprint Rhodium400 and its STOCK radio version is 2.32.00.WU, so I mean according to what I read this is unlocked.
anyway, I was just wondering what if any point doing the Security Unlock has for me?

the SIM unlock is to use it on US GSM networks such as ATT and TMobile, it doesnt allow it to work on other CDMA networks like Verizon

Oh ok, thanks for the heads up on that one.
Good looking out (I was wondering about that for the longest time)

Jamio88 said:
I was just wondering what the point of doing this is? Like is it just so I could use like the Verizon CDMA network or what?
I have the Sprint Rhodium400 and its STOCK radio version is 2.32.00.WU, so I mean according to what I read this is unlocked.
anyway, I was just wondering what if any point doing the Security Unlock has for me?
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If your radio says WU that means that you can use any GSM sim card (not CDMA) on any network w ur phone. Security unlock - HSPL will let you flash your phone with custom roms. You can find more info about HSPL by following thread by OLIPRO. Of course thank him for his work. Have fun flashing.
FYI... Do not flash your phone w CDMA roms.

mboguc said:
If your radio says WU that means that you can use any GSM sim card (not CDMA) on any network w ur phone. Security unlock - HSPL will let you flash your phone with custom roms. You can find more info about HSPL by following thread by OLIPRO. Of course thank him for his work. Have fun flashing.
FYI... Do not flash your phone w CDMA roms.
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Click to collapse
This is not true. The stock radio in verizon roms has a wu but all sims are locked minus the stock vodaphone sim. The locked sim does not have to do with the radio on the verizon tp2.

drewcam888 said:
This is not true. The stock radio in verizon roms has a wu but all sims are locked minus the stock vodaphone sim. The locked sim does not have to do with the radio on the verizon tp2.
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first. he has sprint..
second. verizon doesnt have wu.. unless you flash it w one (stock is always wv)
i do give you credit cuz i did not know that wu may still be locked.
no hard feelings.
peace

The Sprint TP2 has no SIM lock in the system, but the radio ROM is lacking support for the US bands. So while the Sprint TP2 will accept any SIM it will not get a SIGNAL in North America unless you pay for the security unlock and apply a patched radio.
The Verizon TP2 HAS a SIM lock in the system, but the radio ROM has full support for the US bands. So if you just want to use a SIM card, then all you need to do is get an unlock code from Verizon.
Both version radios have support for Euro bands.
Default behaviour:
Sprint = Use any SIM you want, but only get a signal in Europe and Japan when in GSM mode.
Verizon = Can't use *any* SIM except Verizon until you unlock, but to unlock you can do it by requesting a free code from Verizon CS.

so u can use ur phone on a different network (phones with sim cards obviously)

SiL3nTKiLL said:
so u can use ur phone on a different network (phones with sim cards obviously)
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Yes. Once unlocked, you can switch the phone to GSM mode and use any GSM SIM card.

I do have Sprint (The Rhodium400).
It has been HSPL Unlocked for about 6 or 7 weeks now, just was curious about the Radio unlocking stuff (as I have never messed around with it).
I have already run the gauntlet of the various Custom ROMs out there. All (well most of) them seemed to be very VERY well built, however none seemed to suit me to quite 100%, so I have been working on my own for about 3 weeks now give or take.
It is a slow going process (mainly due to working so much), but it is very fun and a learning experience none the less. Looking forward to the day it is finished (So that I can start on the next one, lol).

gamescan said:
The Sprint TP2 has no SIM lock in the system, but the radio ROM is lacking support for the US bands. So while the Sprint TP2 will accept any SIM it will not get a SIGNAL in North America unless you pay for the security unlock and apply a patched radio.
The Verizon TP2 HAS a SIM lock in the system, but the radio ROM has full support for the US bands. So if you just want to use a SIM card, then all you need to do is get an unlock code from Verizon.
Both version radios have support for Euro bands.
Default behaviour:
Sprint = Use any SIM you want, but only get a signal in Europe and Japan when in GSM mode.
Verizon = Can't use *any* SIM except Verizon until you unlock, but to unlock you can do it by requesting a free code from Verizon CS.
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Click to collapse
..also thought I read somewhere in CMONEX thread a recap saying if unlocking sprint radio/SIM you'd be able to use Verizon towers... (will look for post & put hyperlink here soon)
also, from ppc/cmonex sticky:
BIG NOTE: if you have the Sprint branded TP2, then after running this SIM/Sec Unlocker, you'll need to flash a patched sprint radio (in other thread) to finish the process.
... sprint is a Security (CID) unlocker, which needs unlocking first, then a "patched" (unlocked?) sprint radio also...
"Originally Posted by Syriel View Post
By default, the stock Sprint radio only has support for GSM 900/1800 (Euro bands) even though the hardware supports GSM 850/900/1800/1900. When you flash Oli's WU radio to the Sprint TP2 it re-enables support for GSM 850/1900 (NA bands).
The reason that Sprint disabled the (NA bands) is because the Sprint TP2 (unlike the VZW TP2) is SIM unlocked from the factory. The VZW TP2 ships with full band support, but it is SIM locked from the factory.
"
Guess I'd just make it simple: Sprint needs a band enabler - 850/1900 (security unlocker?) & then a radio that works on it... (patched WU)

So I have Sprint service on my TP2.. if I unlocked it would I be able to receive a call from either network or do I have to manually select one and swap back and forth?
I can understand having a default outgoing radio (choosing CDMA or GSM).. but it'd be more useful to have the ability to take make use of both lines..

slappy76 said:
So I have Sprint service on my TP2.. if I unlocked it would I be able to receive a call from either network or do I have to manually select one and swap back and forth?
I can understand having a default outgoing radio (choosing CDMA or GSM).. but it'd be more useful to have the ability to take make use of both lines..
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you would have to switch back and forth
and of course have a SIM card from a GSM provider like ATT or T-Mobile

S6 region locked

Can anyone tell me if the phones is region locked? Thanks

i am not sure what you are looking for but i do know that there is a thread on here where someone tried a Verizon SIM in a Tmob and ATT S6 and neither one worked on Verizon.

Generally Verizon phones are SIM unlocked so u can use them on Tom or att but don't expect to get lte coverage since the phones have different bands enabled.

fletch33 said:
i am not sure what you are looking for but i do know that there is a thread on here where someone tried a Verizon SIM in a Tmob and ATT S6 and neither one worked on Verizon.
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That's because those don't have CDMA radios, and at least the AT&T one is locked. Verizon phones come SIM-unlocked and work with other carriers. If you use a T-Mobile SIM you'll see an "unknown SIM" message, but it will work assuming the bands match. You should be able to get LTE with T-Mobile as most of their network uses band 4.

He means region locked, like usa

geoff5093 said:
That's because those don't have CDMA radios, and at least the AT&T one is locked. Verizon phones come SIM-unlocked and work with other carriers. If you use a T-Mobile SIM you'll see an "unknown SIM" message, but it will work assuming the bands match. You should be able to get LTE with T-Mobile as most of their network uses band 4.
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Anyway to get rid of this message? My g2 I had to root it to get rid of it. I hope I don't have to root the s6 just for that because it gets really anoying just having the icon showing unknown sim the whole time.
Sent from my VS980 4G using XDA Free mobile app

Verizon M8 only connecting to 2G/GSM networks. No 3G/4G.

Hi All,
The issue with my Verizon M8 [the rare LRA (LTE for Rural America) subvariant] is that no matter what firmware version/RUU I use, I only get GSM connectivity on it. No WCDMA or LTE. I have checked the WCDMA bands in my country and that is not an issue. When I select WCDMA only option, I cannot get any signal. I have flashed the all the LRA (*.**.512.*) RUUs as well as all the Verizon (*.**.605.*) RUUs but no luck at all. If this issue might be related to PRL settings then please let me know if any of you have any idea. I have also checked the relevant WCDMA/LTE bands via CDMA tool and they are also enabled.
My M8 is currently S-off and has Super CID. I am using it outside the US on GSM network.
This has got me very frustrating and I need to find out if this is a software issue or a hardware issue. One more thing is that another guy here has exactly the same variant as mine. He bricked his radio by flashing the GSM firmware. I provided him my phone's relevant partition dumps and after flashing those onto his phone, his phone's radio became operational but now he has the same issue as mine. So I think that this issue might not be hardware related.
Any help on this will be greatly appreciated!!

Same problem

Anyone can provide any help on this??

any1 please help??

junaidawan86 said:
any1 please help??
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do you know the actual bands/frequency the gsm network uses where you are? the prl is going to be pulled from your sim card. have you also tried a diff sim card?

izzaeroth said:
do you know the actual bands/frequency the gsm network uses where you are? the prl is going to be pulled from your sim card. have you also tried a diff sim card?
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Hello. Yes, I know the bands used by 2G, 3G and 4G in my country. And yes I have switched sim cards even from different networks. The PRL version shows as 00000 when i look at it from the settings. I have even tried to update the PRL from a prl file provided by a xda user in some other thread but still it shows as 00000. I have seen some threads and ppl had this problem with One S. Though some of them were able to correct it by flashing some stock and custom radios.

junaidawan86 said:
Hello. Yes, I know the bands used by 2G, 3G and 4G in my country. And yes I have switched sim cards even from different networks. The PRL version shows as 00000 when i look at it from the settings. I have even tried to update the PRL from a prl file provided by a xda user in some other thread but still it shows as 00000. I have seen some threads and ppl had this problem with One S. Though some of them were able to correct it by flashing some stock and custom radios.
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odd. i wonder if that lra model is sim locked like the sprint variant. is it also acknowledging you have a sim card inserted when you check in about phone? as in, does it display the sim #

izzaeroth said:
odd. i wonder if that lra model is sim locked like the sprint variant. is it also acknowledging you have a sim card inserted when you check in about phone? as in, does it display the sim #
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Well, I thought too that it might be sim locked but then why it is working with 2G networks. There should be no signal at all then. Also these LRA variants are being sold by many online retailers including Amazon as sim unlocked phones. And yes it acknowledges when I insert or change a sim. Says "Preparing sim card" and then I get a signal (2G only). When I choose 3G only in network settings, the signal is gone immediately and I have to switch back to auto or 2G only to get the signal back.

@redpoint73
Any help on this???

junaidawan86 said:
Hello. Yes, I know the bands used by 2G, 3G and 4G in my country.
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Click to collapse
So then list the specific band numbers for 2G, 3G, and LTE for your carrier. That is really what the previous response was asking.

redpoint73 said:
So then list the specific band numbers for 2G, 3G, and LTE for your carrier. That is really what the previous response was asking.
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900/1800MHz for 2G
2100MHz for 3G
850/1800MHz for 4G/LTE

junaidawan86 said:
900/1800MHz for 2G
2100MHz for 3G
850/1800MHz for 4G/LTE
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Click to collapse
This is strange, as the 3G band 2100 Mhz is really common (many countries use it for 3G, and most any recent US phone intended for foreign travel will support it), and should be supported by the device out-of-the-box. This tells me the problem is likely not RUU/firmware related.
You sure the APN is properly typed? And does your carrier use any different APN for 3G, LTE, etc.?

redpoint73 said:
This is strange, as the 3G band 2100 Mhz is really common (many countries use it for 3G, and most any recent US phone intended for foreign travel will support it), and should be supported by the device out-of-the-box. This tells me the problem is likely not RUU/firmware related.
You sure the APN is properly typed? And does your carrier use any different APN for 3G, LTE, etc.?
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No it uses the same APN for all types and its configured correctly. I also thought the issue might rather be related to some NV values or PRL. If I set it to 3G only, it "Sees" the carrier as I can see a signal bar in network signal guru app, but the mobile is not able to connect to it.

so i am thinking that since this is a lra variant, a lot of bands may be disabled. have you seen anywhere else that someone got a lra variant to work outside the us? i know you said people were selling it as being unlocked, but maybe its not

izzaeroth said:
so i am thinking that since this is a lra variant, a lot of bands may be disabled. have you seen anywhere else that someone got a lra variant to work outside the us? i know you said people were selling it as being unlocked, but maybe its not
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Click to collapse
Well the LRA variant is practically the Verizon one with everything same as the Verizon variant. There a lot of links on both Amazon and eBay in which its mentioned that its LRA variant and is factory unlocked and can be used anywhere in the world. And yes I came across various threads on XDA in which people had this same variant, working fine (3G atleast) but they wanted to upgrade to Android 6 MM as there is no official update available for this variant after Android 5 Lollipop. As for the relevant bands (2100MHz for 3G used in my country), they were already unlocked (checked via CDMA Tool and QXDM).

junaidawan86 said:
Well the LRA variant is practically the Verizon one with everything same as the Verizon variant. There a lot of links on both Amazon and eBay in which its mentioned that its LRA variant and is factory unlocked and can be used anywhere in the world. And yes I came across various threads on XDA in which people had this same variant, working fine (3G atleast) but they wanted to upgrade to Android 6 MM as there is no official update available for this variant after Android 5 Lollipop. As for the relevant bands (2100MHz for 3G used in my country), they were already unlocked (checked via CDMA Tool and QXDM).
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hmm this is quite the problem. if you can confirm you are using the same rom as the others, i would then think the issue is the radio being defective

izzaeroth said:
hmm this is quite the problem. if you can confirm you are using the same rom as the others, i would then think the issue is the radio being defective
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Click to collapse
I am using the stock LRA RUU (android 5.0.2). I have also tried the VZW RUUs from 4.4 to 6.0 but the same issue exists on them all. Even I have used GPE and Sense based custom roms but the same issue. I think that the issue might be related to some NV values or this phone might be network locked. Is there a way to check if the phone is network/sim locked? As I am getting the (2G) signals for all the networks in my country.

junaidawan86 said:
I am using the stock LRA RUU (android 5.0.2). I have also tried the VZW RUUs from 4.4 to 6.0 but the same issue exists on them all. Even I have used GPE and Sense based custom roms but the same issue. I think that the issue might be related to some NV values or this phone might be network locked. Is there a way to check if the phone is network/sim locked? As I am getting the (2G) signals for all the networks in my country.
Click to expand...
Click to collapse
it being sim/network locked makes sense, because the phone was made for people who live in the middle of nowhere. there would also be a high probability that none of those people will ever travel outside the country. i do not know anything about the nv values and tweaking them, but i have looked at that thread a few times. lastly, if you have only picked up 2g regardless of sim or apn used, it could be defective radios

junaidawan86 said:
Well, I thought too that it might be sim locked but then why it is working with 2G networks. There should be no signal at all then. Also these LRA variants are being sold by many online retailers including Amazon as sim unlocked phones. And yes it acknowledges when I insert or change a sim. Says "Preparing sim card" and then I get a signal (2G only). When I choose 3G only in network settings, the signal is gone immediately and I have to switch back to auto or 2G only to get the signal back.
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did you get the solution for the problem since i need help as i am facing the same problem

quican said:
did you get the solution for the problem since i need help as i am facing the same problem
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Click to collapse
yes I got my issue fixed. Can u confirm which device you have? software version *.*.512* or *.*.605.*?

Ordered ATT S8+ SM-G955UZKAATT

Will this be the same hardware as other carriers like the S7's were? I was reading that T-Mobiles new band 66 will be usable(unused frequency) on the S8's. If Tmobile ever works in my area I would like to know if I can flash TMO firmware on my device or U firmware to my device like you could on S7's. On S7's you could go between cdma and gsm carriers with a flash Anyone have a link to network specs of S8's?

johnwayne27 said:
Will this be the same hardware as other carriers like the S7's were? I was reading that T-Mobiles new band 66 will be usable(unused frequency) on the S8's. If Tmobile ever works in my area I would like to know if I can flash TMO firmware on my device or U firmware to my device like you could on S7's. On S7's you could go between cdma and gsm carriers with a flash Anyone have a link to network specs of S8's?
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Click to collapse
root is completely a lost cause and will never happen most likely on any AT&T samsung device

I never mentioned root, wrong post?

You dont need root to flash firmware in odin

johnwayne27 said:
Will this be the same hardware as other carriers like the S7's were? I was reading that T-Mobiles new band 66 will be usable(unused frequency) on the S8's. If Tmobile ever works in my area I would like to know if I can flash TMO firmware on my device or U firmware to my device like you could on S7's. On S7's you could go between cdma and gsm carriers with a flash Anyone have a link to network specs of S8's?
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Click to collapse
They will all be exactly the same. There will be only one model in the US. If you sim unlock, and switch sims, do a factory reset, it will boot with the new carriers boot screen and bloat. Currently testing S8 and had mine locked to Att, but switched to Tmobile

bossg4 said:
They will all be exactly the same. There will be only one model in the US. If you sim unlock, and switch sims, do a factory reset, it will boot with the new carriers boot screen and bloat. Currently testing S8 and had mine locked to Att, but switched to Tmobile
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Click to collapse
Any place you can point to that confirms in writing the carrier variants all aupport the same bands? The carrier websites all show different band support from what ive found so far.

954wrecker said:
Any place you can point to that confirms in writing the carrier variants all aupport the same bands? The carrier websites all show different band support from what ive found so far.
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Click to collapse
I do not, I looked as well. When I asked about my Att phone booting up with T-mobile boot after unlock and Sim swap, I was told it was called one sku. I have see att to T-mobile swap as well as Verizon to Att. Even though my device was locked to att, i can connect to new lte u network.

bossg4 said:
I do not, I looked as well. When I asked about my Att phone booting up with T-mobile boot after unlock and Sim swap, I was told it was called one sku. I have see att to T-mobile swap as well as Verizon to Att. Even though my device was locked to att, i can connect to new lte u network.
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Click to collapse
What phone are you speaking about?

bossg4 said:
I do not, I looked as well. When I asked about my Att phone booting up with T-mobile boot after unlock and Sim swap, I was told it was called one sku. I have see att to T-mobile swap as well as Verizon to Att. Even though my device was locked to att, i can connect to new lte u network.
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Click to collapse
There is only 1 model number

Can unlocked TMobile version of this phone work with Verizon?

Will an unlocked TMobile version of this phone work on an existing Verizon line without having to ask verizon to white list the imei or add cdma less etc?

I have
pj1980 said:
Will an unlocked TMobile version of this phone work on an existing Verizon line without having to ask verizon to white list the imei or add cdma less etc?
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I have Unlocked T-mobile A71 5G, It works on Verizon network like 4G LTE (just swap the SIM card even I have 5G Sim card from Verizon) but NO 5G because they are using different 5G Band.

I have the same question, but on cricket wireless, I can't get the phone to login to their network

It works just fine on any GSM/LTE network. I have not checked this personally for this device, but depending on the variant you have, you may be missing some LTE or 5G bands specific Verizon. You may not get full performance. That must be verified though.