Hi Carl,
No you can buy two sorts with Vodafone. One is for volume usuage. You can have it for 90 days etc and if you only check your emails etc, the 20 euros will last a while.
But we opted for the 7 days of unlimited internet for 20 euros. We actually purchased 7 days the previous week and you can use it as much as you want over the 7 days. We then decided to buy another 7 days as it was cheaper to buy another 7 days than use the internet cafes. My husband plays a gamer which involves downloading loads of data, so this package is ideal.
Today though it worked, so it must have been a signal problem.
Trouble is now, we are back in the UK and the dongle is for use in Spain. We wanted it for two days whilst we were there, but the signal wasn’t availabe, so we have lost the 20 euros.