Telephone appointment Dr?

Hi all. Hope you're all well and safe. 

I am having some problems with my asthma today, and feel that I am starting with a chest infection (which I often get). 

I know this isn't the dreaded virus, I also know that if I ignore this, it will get worse and I will be at risk of needing help which I would obviously like to avoid. 

One of my Spanish colleagues told me that it is possible to book a telephone appointment through the app, but I have not been able to do this. I am not sure if I'm doing this wrong. 

The phone lines at my health centre are ringing out but not being answered so I understand that they are either busy or working from home. 

Is there another way of getting a telephone appointment with my Dr? I've lived here since August and not needed medical help other than ordering repeat scripts so this is all new to me!