1. Thank you for calling.
谢谢您打电话来。
还能这样说：
It is nice of you to call.
Thanks for calling me.
应用解析：
call off 取消，叫走，使转移;
call on 拜访，要求，招致，指名;
call out at 对某人高声叫喊;
call over 点名;
call round 拜访
2. I've enjoyed talking to you.
同你谈话很愉快。
还能这样说：
It's nice talking with you.
Talking with you is a great pleasure.
谚语：
To teach a pig to play on a flute.
对牛弹琴。
3. I've got to hang up now.
我得挂电话了。
还能这样说：
I've to end the phone now.
I'll have to ring off now.
应用解析：
Really now! (=Now Really!)
哎呀!真的吗!不会吧!
4. I would not delay your precious time.
我不耽误您宝贵的时间了。
还能这样说：
I won't take any more of your time.
I won't keep you any longer.
应用解析：
admit of no delay 刻不容缓;
without delay 赶快，立刻;
unreasonable delay 无理的拖延;
delay in payment 延期付款