Until now, I had been in a serious problem. (In English, we do not say "in a problem". Usually something like "Recently I've been having a serious problem" or "Recently I had a serious problem" or "Lately I have been having some problems.")
It happened suddenly, it was that there was something wrong with my iphone, well, telling the truth, my iphone have not worked now. ("My iPhone broke suddenly." "Out of the blue, there was something wrong with my iPhone" "There is something wrong with my iPhone." "To tell you the truth, my iPhone has not been working recently.)
I didn't know that the reason why it happened with mine, so I attempted kind of any idea that I could come up with my mind for now, but my iphone didn't get better at all. (I would say: "I don't know why it happened. I tried everything I could, but my iPhone still didn't work.")
Actually, I had just changed out my iphone5s, which I had before, into a iphone6s last year, (so I mean = usually in conversation, not in writing) I thought it was too early for that my iphone6s to break became out of order for new one. And then, roughly 3 hours ago, I came up with an idea. what a nice idea came up with me It is restoring iphone on itunes ("I could restore my iPhone on iTunes." is more natural). I heard from someone that this method might be good for your broken iphone. But, at first, actually I didn't realize in this way, think of this because I tried doing any way to fix it before, but every other way I tried didn't make through this fix the problem. I thought if I tried this way, the result would be the same. (「と思う」の逆に"I thought" は英語で始めに入れます。)
However, the rest of way to fix my iphone was only this, so I tried doing it half in doubt. (This doesn't sound right. More natural: "I doubted that it would fix my phone as I was doing it." or "I wasn't sure if it would work while I was fixing it.)
And what was the result? I fixed it. My iphone is now working. However, now it sometimes goes out of coverage.. what's the hell...