Overseas wireless option

I learned about renting a portable WiFi on the Visit Britain site and from friends but I was looking for a cheaper option than the £10 per day.  The websites of the UK wireless companies had pay as you go plans but it wasn’t clear if they were available to non UK residents if if there were other fees involved.  So our first stop in downtown Edinburgh was the Vodafone store.  They are a large telecommunications company like AT&T.  They had two starter pay as you go WiFi hotspot options, 3G for £50 or 4G £60,  both with 6gb of data which includes the cost of the device.  Since they were out of stock of the 4G hotspot device the choice was made for us.  6gb should be enough as lots of places including our train to London includes WiFi.  And from the coverage maps it’s mostly 3G or slower outside the major cities.