351 He is not in now.
352 He has not come in yet.
353 He will be here in 30 minutes.
354 He has gone home.
355 He is in conference.
356 May I take your message?
357 May I have him call you back?
358 I am sorry Mr. Chen is unavailable, would you like to speak to anyone else?
359 I will transfer this call to Mr. Chen.
360 Would you hold the line, please, I will find out his number for you.
361 I am sorry to keep you waiting.
362 His extension number is 285.
363 He is speaking on another phone.
364 Would you please take a message?
365 Would you like to leave any message?
366 I would like to place a station-to-station call.
367 I would like to place a person-to-person call.
368 I don't know how to do that.
369 Will you accept the charge?
370 Where is the telephone office?
371 Is there a public phone near here?
372 Do you have a coin for the phone?
373 How do I call this number?
374 Do you have a phone book (directory)?
375 I would like to make a long distance call to Taibei.
376 I want to make an overseas call to the United States?
377 How much is a call to the United States?
378 Will you please call me back?
379 May I use your telephone?
380 Someone is using the phone.
381 Do you have an extension?
382 We don't have an extension.
383 There is a phone booth in the corner.
384 It is a pay phone.
385 Whom do you want to call？
386 I want to make a local call.
387 What is the number?
388 Call information for the number.
389 The phone seems to be out of order.
390 I tried several times to call, but there is no answer
391 I 'm going to dial the number.
392 The telephone is ringing.
393 No one is answering the phone..
394 My friend phoned me at 10 a.m. yesterday.
395 The phone is busy.
396 Sorry to have kept you waiting.
397 Who do you want to speak to?
398 What number are you calling?
399 Operator, you gave me a wrong number.
400 Where are you calling from?