1、请给某人/某单位打电话：
Would/could/can you ring up...?请你...打电话好吧?
句中ring up意思是给某人打电话。除了用ring up外，还可用call，call up，telephone 等，意思相同。can you...?用得最普通;could/would you...?用在正式场合，比较礼貌。
2、电话拨不通时常说：
The line is busy 。I cant get through。电话占线，我打不通。/ Ill try again later。我过一会儿再打。
其中line指电话线路，get through 指接通电话。
3、电话拨通后相互打招呼：
Hello，(name or telephone number)你好，(并通报本人的姓名或单位名称或电话号码)Hello，is that...speaking?你是...吗? / Who is that speaking/calling?你是谁?/ Who is speaking/calling， please?你是谁?
应答时常说：Yes，(this is)...speaking。是的，我是...。/ Yes，its...here。 我是...。
4、打电话请对方找人或留言：
Is...in/at home? 某某在家吗?/ Can/may/could I speak to...，please?请...接电话好吗?/ Will/would you give a message to...，please?请给...捎个口信好吗? / Would you tell him my telephone number， please? 请你把我的电话号码告诉他好吗?/ Can/could you ask...to ring me back， please?请叫...给我回个电话好吗?
应答时常说：
Hold on/Wait a minute/One moment， please。 请等一等。/ Im sorry...is not in。/at home now。对不起，...现在不在。/ Can I take a message? 我能给你捎口信好吗?/ Does he have your telephone number?他有你的电话号码吗?/ Ill ask him to call you back。 我叫他给你回电话。