<human>: Can you provide a brief overview of the text?

Me and my actual boyfriend are both quite introvert types... I am doing my best trying to open myself with him and making himself enough comfortable to open himself with me. But he doesn't seem to feel my same urge to solve the issue. 
The main thing which gives me anxiety is that he never never never calls me on the phone (the few times he did it it was after my direct/indirect request)...
So the days in which we don't see each other I feel lucky if I receive more than one text during the day. I have tried to talk with him about this problem many times but it seems for him a big effort just texting me... 
Also he refuses completely to use skype (I have never understood really why). 
He basically has told me that when he is on the phone he doesn't know what to say and that's why he doesn't like to use it. But for me it is really important because sometimes I am not so sure that he is really into me and just a call would be a big help to reassure me...I really love him and I think he loves me too in his way, but I would like a little change from him...and I have no idea if it will ever improve with time...
Have you ever experienced anything like that? Both girlfriend/boyfriend's point of view will be helpful.
thanks
<bot>: my boyfriend never calls me on the phone; for me this is an important component of the relationship, for him it seems a big effort. Not sure what to do.