Why can't I phone an NHS Hospital to make appointment?

Using the Smarty chat, I was told that NHS phone numbers were premium services and I needed to buy and add-on service from Smarty. This is incorrect. ALL UK NHS hospital numbers are standard rate numbers. So internal hospital numbers are 'private by default' under a recent NHS short-term policy to prevent criminals accessing the hospital networks.The numbers I used to phone my local hospital are standard rate numbers. They should not be barred on Smarty networks. Using an iPhone one the Smarty network, I was able to contact the hospital to get my health. Thank you.