Can anyone who uses card readers at craft fairs ect. tell me how much data it uses and when? Does the card reader use the internet the whole time it is on (ie, the length of the fair) or just when a transaction is being processed? And do different card readers use different amounts of data? I don’t have a smart phone so I’m going to have to get a sim specially (and use my Dad’s cast off smart phone) and I need to know how much data I‘m going to need (I’m only going to use it for card transactions, not as a phone).
There is the option of using my brother’s phone as a wifi hotspot but I don’t want to have that as the first option as it means I’ll have to take the phone off him for a day!