Hi; obviously free instore wifi is pretty much widespread (especially in the UK) - with pretty much each store having their own dedicated form of free wifi either operated by themselves or ran by for example BT, sky or O2 etc. As some of these stores are large department stores or supermarkets which lack mobile connection sometimes (especially on the likes of EE & Three with the type of frequency used compared to O2 & Vodafone) - I tend to use Wifi calling in some of these stores on the EE network. Although I've found that some stores freely allow wifi calling whilst others are actively blocking the ports which wifi calling need to operate. I have therefore emailed a few of the offending stores trying to get them to allow the use of wifi calling. Sainsburys have basically told me the below after spending a few days investigating - "Hey Aaron, we have investigated this issue and have found the Network ports required to allow EE voice calls are blocked by default. This is by design, thus preventing users from establishing VPN site to site connectivity from the store to end points unknown. Hope this helps" Now I can completely understand their concern with this; however my question is surely they can open the required ports for wifi calling use only whilst blocking any use of VPN? Are they just being ridiculous on this; seeing as what is the use of a wifi connection if it can not be used for the most basic feature of a phone?