Hello) problem with SIM card

I understand.

The problem is that for some reason (perhaps an upgrade of the operating system) the software on the phone is viewing the sim slot as being locked to a carrier other than the one you wish to use.

There is no way for you, as a user, to change that situation, unfortunately.

It would help if you would translate that or post the text so it can be translated. It may be difficult for most that respond here to understand what it is that is posted there. Once you either translate or post the text so someone else can translate it, you should get a response.

You need to contact the carrier to which the phone is locked and see if you are eligible for an unlock.

If you bought the phone and it was supposed to work with your carrier, contact the seller and try to obtain a refund.

That means the iPhone is locked to a carrier which is different to the carrier the sim card is for.

If the iPhone was hacked by an unauthorized 3rd party to unlock it, those unlocking hacks generally get undone when the device is restored or the iOS is updated.

There's nothing really to be done other than getting it unlocked by the carrier it is locked to.

Getting a 3rd party unlocking service will result in the same outcome when its updated again.

Unfortunately, if you cannot contact the carrier it is locked to, there's not much else to be done. You can try to sell it. Or -get it unlocked by some other means which cannot be discussed here.

Approach what?

Hacking it to unlock it will void the warranty.

We cannot discuss hacking of any type on these forums.