I couldn't get through—the line's engaged.

我打不通电话—线路忙。

《牛津词典》

I tried to call you but I couldn't get through.

我给你打电话了，可是怎么也打不通。

《牛津词典》

I tried calling you several times but I couldn't get through.

我试着给你打了几次电话，但都没联系上。

《牛津词典》

She said that she would be slightly delayed but when I began calling her after 8pm, I couldn't get through to her.

BBC: Delhi rape victim's family: She was brave, full of life

"One thing I couldn't get at Wal-Mart was a chainsaw, or else we could have gotten through more logs, " he said somewhat regretfully.

CNN: photojournalist shares travel secrets

And to watch video on one of the Samsung apps, the one called Samsung Hub, you have to navigate through two screens trying to sell you video that I couldn't get to work on the other apps.

NPR: Review: Galaxy S4 Decent, But Filled With Gimmicks