我给打过电话，但没有打通。 The use of 过 (not experienced) Hello I want to ask for the use of 过 in this sentence.


我给打过电话，但没有打通。
The translation of the book says,  I tried, albeit unsuccessfully, to phone her.
大卫的朋友最近打过电话给大卫吗?


What I understood is that 过 is to do with something if it has been experienced. For example 你看过这本书。  Have you (ever) read this book? But in the above example when it says 最近 it means that maybe they have telephoned before.

What is the difference in this sentences if you use 了?

Thanks in advance.
过 means: has done something
so 打过电话 means i have called him

in the mean time : 打了电话 means: i called him

the difference of the two chinese saying is: the first sentence is to emphasize that something is done by you, while "打了电话" or "打啦电话" is to telling a fact