1. I'm sorry I have the wrong number.
抱歉我打错电话了。
还能这样说：
Sorry, I must have misdialed the wrong number.
I'm sorry. I think I must have dialed the wrong number.
应用解析：
suffer wrong 受害，受到非法对待;
put sb. in the wrong 冤枉某人、委屈某人，诬陷某人;
right a wrong 纠正错误，平反，报仇
come wrong 不被接受，不受欢迎
2. Sorry for troubling you.
对不起，打扰您了。
还能这样说：
Sorry to have troubled you.
I'm sorry to have bothered you.
应用解析：
borrow trouble 自寻苦恼，杞人忧天;
give sb. trouble 麻烦别人;
go to the trouble 不怕麻烦，特意;
have trouble with 有……病痛
3. Sorry, I was given the wrong number.
对不起，我得到的这个电话号码是错的。
还能这样说：
Sorry, I got the wrong number.
Sorry, the telephone number I was given is wrong.
谚语：
Give him an inch and he will take an ell.
得寸进尺。
4. Could you tell me whether it is 67856628?
您的电话是67856628吗?
还能这样说：
Would you like to let me know whether it is 67856628?
Could I check the number? Is it 67856628?
谚语：
Tell me and I'll forget. Show me, and I may not remember. Let me try and I'll understand.
实践出真知。