I wanted to call you but at the same time you called me. "but"

i wanted to call you at the same time you called me . ---------i would say, i was about to call you when i got your call.

I was trying to call you while you were calling me. We were trying to call each other simutanously.

It is also possible to be in this way: I wanted to call you and suddenly you called me.

As Niney said, the sentence would be correct with a "but" added. Generally, we may say something along the lines of "What a coincidence, I was just going to call you." or "I was about to call you." The word "coincidence" refers to two similar things happening in or around the same time or way, but not being directly related to eachother in cause. So you you both wanting to call eachother at the same time could be considered a coincident.