In formal writing, do not use 'I'm'; instead, use 'I am'. I am unsure if you telphoned me yesterday regarding an interview. As I seem unable to reach you via telphone, I have sent you this e-mail.
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Ice2007I'm not sure is you call me yesterdat for interview or not. But I don't want to miss the changes, therfore, I send you a email. I cannot reach your telephone no. xxxxx. Do you mind to call me again or reply me by return email. My mobile phone no. is xxxx.I'm not sure if you called me yesterday for the interview or n