Dear Sir,
Following my phone interview on August 12th, you informed me the interview process will be completed in two weeks. I have been hoping to hear back from you. Understandably, I am curious to know if the interview process has been completed; and, whether or not you have chosen a candidate? If you would please let me know the results at your earliest convenience, I would be most appreciative.

Thank you for your time.

Best Regards,

Note; you could also switch the last sentence around:
I would very much appreciate if you would please let me know the results at your earliest convenience.

The ending could also be:
Thank you for your time and consideration.

I don't normally completely change text like this; but, in this case I felt the letter was too short to be considered polite. So, I rewrote the letter in a way I would normally expect.

Good luck in your job search.

ask the interview result by email

I took an a telephone interview on the 12th and the Geman HR told me to wait for the result in two weeks. Well, He still didnt reply me by now, so Im considering to write him an email. like,

Dear Sir,

How are you?

It's been more than two weeks since the interveiw. and I'm wondering how is the application process is going? Does Has the result come out been decided? Thanks.

Best regards!

Good luck