The iPhone carrier unlocks SIM card insertion, and the process goes through TSmi, ICCID black solution, QPE based on eSIM to now based on Qualcomm-based MepIt's been many years; I started this hobby back in the iPhone 5 era. Removing the SIM sticker and experiencing it like the Chinese version is the wish of many card sticker playersThe official dismissedThis path is absolutely essential.
My knowledge is limited and I rely solely on experienceIf there are any inaccuracies, feel free to point them out. Thank you~

(To prevent confrontation, since the 14 series, the US version has required punch-holes. The 14 and 16 series are available in the Chinese market, but you still need to disassemble and solder the device to insert the card, which some scoff at as the so-called 'brand new, only major overhaul.' So why are so many people still rushing in? Price is the deciding factor. )
Usually, what you buy on the market are the US version of Verizon (V version), T-Mobile (T version), AT&T (att version), Spectrum (SPE version), Xfinity (XF version), Dish Boost (Dish version), Cricket, Tracfone (TF version), Reseller Flex (flexible strategy), US cellular/consumer cellular ( China Lockless), and various small carriers. China Lockless is much more expensive than Locked, so there's not much to discuss. Flexible options are generally more common during the activation phase.
About V Edition:
(1) Eligible for whitelist, after more than 30 days, the probability of automatic unlocking around 60 days is relatively high;
(2) Whitelist, but not eligible; you can pay to enter the qualification first, then wait 60 days; Or put up an account; Or unlock directly through high-priced car channels;
(2) Blacklist unpaid fees cannot be unlocked for now;
(3) If you lose your blacklist, you can try to renew your name + unlock it, but I haven't succeeded so far. If you get blacklisted, GSMA is most likely blacklisted, even if you unlock it. So in the US, your platform is basically unusable—only by changing your SIM card or using it in Asia.
See the chart for specific unlocking policies. After the FCC tightens regulations, unlocking may become more difficult.

VIP version official website unlock strategy description.

About the ATT version
You can try submitting and unlocking directly on the official website (the effect is consistent with the 8 Mao official account).
Website:View the link
(1) If the submission is successful, there will be an email. You need to click confirm in the email to proceed to the actual unlocking process;
(2) Reporting to the ATT whitelist for unpaid feesaid, too many whitelist unpaid fees, these types cannot be unlocked.
(3)Past_due If overdue, check the blacklist and whitelist. Just use the official account to unlock the corresponding whitelist (the actual test probability isn't as high as mentioned; recently, neither of my titles was successfully unlocked).)
(4) Active on another account / This device is no longer active. In this case, you can argue with customer service, resubmit it on the official website after a few days, or pay to unlock it via the official account;
(5) We can't locate it in our database, meaning no data. This requires checking the blacklist and whitelist; if you use the whitelist, you can directly argue with customer service or pay to unlock the official account;
(6) Blacklist: There are currently channels to whitewash the name, but the probability is unknown; if you do clear, it will also be on the GSMA blacklist
Check out the chart for the specific unlock policy. Also, I saw a description at the end that multiple attempts to unlock through a single channel will be rejected. In other words, if you keep trying to find a hidden ATT machine and keep submitting from the official website, you will be restricted. Locksmiths have multiple lines, accounts, and emails, so charging you 0.58 yuan isn't expensive.

ATT official website unlocking strategy description.

About the T version
Now there are full black-and-white solutions, but they're still quite expensive. I think for 16 and above, if you get them cheaply, you can pay to solve the problem. Beyond that, the price difference isn't big and not enough to support unlocking the game.
(1) Whitelist: either complete the black-and-white unlock or unlock by adding an account. Previously, one account could unlock two titlesMobile phones(The so-called driver and front passenger), I remember the cost was almost 0.
(2) BlacklistCurrently, the only option is to fully resolve the issue in black and white. But even after unlocking, it was still on the GSMA blacklist.
(3) S to T transition, a historical legacy issue, only existing in the 14 series and earlier. Whitelists can be unlocked cheaply by submitting via the official account. However, I have encountered cases where the unlock was previously unlocked and failed (with unlocking records), and submitting this unlock still fails. (Also, I heard there's a chance of unlocking, but it's still sporadic. I checked the previous unlock, and it seems it hasn't been unlocked yet.) )
The specific unlocking strategy is as follows.

T version official website unlock strategy

Second watch
About the SPE version
Requires 60 days of activation, a whitelist, and unlocking eligibility
If you meet the requirements, you can get it, but currently only high-end cars (17 series 930)You can already buy the unlocked one directly. I haven't mentioned it, so I don't recommend it
The specific unlocking policy is as follows

SPE unlock policy

About the XF version
XF requires a whitelist and must be active for more than 60 days.
If you meet the criteria, you can get one. Currently, the high-end 17 series costs 750 yuan, depending on personal needs
I haven't submitted to this operator before, so I don't know the cycle or probability.
The specific unlocking strategy is as follows:

XF unlocking strategy

About the Dish edition
Currently, the purchase period is > 1 year and the whitelist is required, so only those aged 16 and above can unlock it.
The 16 series costs 400 yuan. If there's a suitable option, you can get in the car, but I haven't tested the driving probability.
The specific unlocking policies are as follows:

DISH unlock policy

About cricket
Currently, only the original owner can unlock it if the user has been online on the C network for more than 180 days, and it is on the whitelist. So, it seems the 16 series is possible;
There are two price options: 25 and 220, you can try it. If you don't have it on hand, you don't know the cycle or probability.
The specific unlocking policy is shown in the chart:

cricket unlock policy

The last TF is a bit sad, I can't access their official websiteI won't write anymore. Currently, contracts are required for more than one year, and there is no special channel.

I found the lock maker myself; there are plenty of public accounts, and they're pretty much the same. Building a locksmith platform only costs about ten thousand yuan. The databases are all purchased upstream and provide interfaces. Spending a little money is fine.
That's all. If you have any corrections, please let me know. I also wish everyone a smooth unlock, Locks become lockless.