The OnePlus 8T is available to purchase from T-Mobile and OnePlus' own online store, though the phone differs slightly depending on where you bought it from. The T-Mobile includes an IP68 rating and various software tweaks, and just like most phones you buy through carriers, it requires a special code to unlock the bootloader. Now, after some early troubles, T-Mobile 8T owners can apply to obtain those unlock codes.
Asus revealed the Zenfone 7 and 7 Pro last month, following months of rumors and speculation. If you don't plan on sticking with the stock ROM, Asus has now released the bootloader unlock tool for both phones, as well as kernel source code packages for developers to try out.
Sony has managed to gain a lot of fans among developers thanks to its Open Devices program. It's an initiative that brings Android Open Source Project (AOSP) builds to some of the company's devices and allows developers to adapt and change the code. It also makes it easier to unlock the bootloader and install custom ROMs. Sony has announced that the latest phone to become part of the Open Devices program is the Xperia 5.
Huawei's newest flagship, the Mate 30, was officially revealed a few days ago. It's an impressive piece of hardware, but its lack of Google services (due to ongoing trade disputes between the United States and China) mean it's going to be a very hard sell outside of China. There was some hope that Huawei would loosen its grip on bootloader unlocks, so buyers could flash an alternate ROM with Google apps, but that won't be happening.
ASUS recently unveiled its 2019 flagship ZenFone 6, and this phone marks quite a shift for the company. Its bezel-less, notch- and cutout-free display brings it on par with the OnePlus 7 Pro, and the flipping back camera is an interesting solution. Coupled with its stock Android experience, the phone is bound to attract some enthusiasts. Now, the company has also released the device's kernel source and unlock tool, making it even more interesting for that demographic.
The new Xperia 10 and 10 Plus might not be the most interesting phones out there, but Sony has made them a bit more appealing for certain buyers today. These phones are the latest additions to Sony's Open Devices program. So, you can unlock and flash software on your Xperia 10 and 10 Plus without any arduous workarounds.
LG's official bootloader unlock tool makes the company seem developer-friendly on the surface, but very few phone variants actually get added to it. For instance, the last supported US-market variant on the rather short list was the LG G6, a phone that was announced nearly two years ago. LG has just added the V40 to the list, but unsurprisingly, only the European-market model is compatible with the tool.
OnePlus has always been enthusiast-oriented. Their phones run close-to-stock software, and it's incredibly easy to get ROMs and custom recoveries onto them. A bootloader unlock request page that just went up on OnePlus's site indicates that could be about to change with the upcoming 6T, which many have speculated will also be sold by T-Mobile.
HMD Global, the manufacturer of the recent Nokia phones, has notoriously been against releasing kernel source codes for its devices, despite their popularity. And even when it does push those out to the development community, it typically prevents people from unlocking the phones' bootloaders, which hampers customization options. But this morning brought news that Nokia 8 owners could do just that: unlock their bootloaders.