Is it stable to unlock iPhone 7 with Super Snow Card Sticker?

I bought a 6sp before and waited for this card to be applied. I tested it after I got it. When plugged in, it will reactivate the iPhone.

After activation, it will be the same as unlocked, mobile volte HD Voice, facetime iMessage can be activated, the local number is normal, and there is no 86 problem. The key is that the signal is perfect, it is indeed the same as unlocked.

Looking at gpp and Chaoxue Weibo, both companies have released corresponding card stickers. They use an activation vulnerability of Apple, so they can achieve signal stability. However, this vulnerability is expected to be blocked by Apple soon. (If the loophole is sealed, new numbers cannot be activated by subsequent card affixing. As long as the previously activated machine is not flashed and the card is changed, it can still be used as if it is unlocked, which is a bit similar to a hacker solution).

In addition, you can upgrade the Super Snow Card without having to buy it again