Google Translate didn't do a good job, so I cleaned up the translation a bit:

A Swedish programmers has discovered a serious security hole in the iPhone. TechWorld's news editor gets his phone hacked - and can not do anything about it.

A few days ago, TechWorld was contacted by the developer Roman Digerberg, who said he'd found serious security holes in iOS. Among other things, he asserted that it was possible to send an anonymous text message that appears on the lock screen, even when this is set to not display messages.

He also said that it was possible to manipulate the number that denotes the number of voice mail messages,
or to just put a red dot in place of the indicator, which the user can not remove.
When TechWorld talks to him, he tells us more:

How did you discover this?
- It was by pure chance. I wrote a program in C# for my GPS tracker, which would facilitate the programming of it.
By mistake I sent the text message to my iPhone which then began to beep and display strange messages on screen.
Soon, I realized that I had created a monster.

What did you do?
- I have been in contact with Apple, both via email and phone, but they seem totally uninterested in this.
I've been thinking about making the source available online. People will start doing harakiri with each other's phones,
but why should you care about it when not even Apple does?

He also reports that he has received offers from several companies that want to buy the software to use it for advertising,
since it is next to impossible to ignore the messages that pop up on the screen.

He offers to demonstrate how it works and TechWorld's news editor gives him his phone number.
Soon, things start to happen in his phone:

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Apparently there were lots of people who tried to call in the last minute. However, the voicemail does not have any new messages.

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But it still says that there were 250 missed calls. And it will not disappear, no matter what we do.

Roman Digerberg calls us to check that it worked. During our conversation, he sends another message:

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Indeed a very good call. But maybe not so fun when ad companies get the technology, starting with mass mailings that
can not be ignored or turned off.

After taking screenshots, he removes everything in seconds.

- You can not remove it, only I can remove it, he explains.

He is also sending over examples of much nastier things he can do:

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So what should we make of this? An extra important call that was missed?

Or this, which has great potential to cause heart attacks:

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He explains, without going further into technical details, that it's about manipulating classes in the message structure. Other than sending messages that can not be avoided and manipulating figures for the number of messages, he says that he also managed to lock a phone altogether and that a restart was required to get it working again.

- Some think that I should start a paid service where you can anonymously send different types of messages.
You can imagine what chaos there would be if people sit and sends unwanted and unavoidable messages to each other and make changes in each other's phones. That said, I realize that this is a monster, says Roman Digerberg.