The only data-only package is the one you've found - 500MB for £5, but you may use any of the goodybags as well, ignoring the minutes and texts.
You can use ANY of the packages as a 'data only' package in a phone or tablet or MiFi, just ignore the minutes.
Hope that this helps you.
Have you tried using your phone as a wifi hot spot you can do that on all smartphones.
That will mean leaving your sim in your phone and still use it to recieve calls and texts and send them too.
Just a thought as thats what i do.
All the best Bob
There is no contract and you can stop using it at any time. Just be aware that when you activate a SIM and add your first goodybag, paying by debit/credit card or paypal, your payment method will be saved and the goodybag set to recur each month until cancelled.
You could also make yourself a few quid in the process (if you click on the banner at the bottom of this post your SIM will have a £5 bonus when you activate it and top it up)..
order your own SIM and get it up and running.
Then order some more SIMs from https://giffgaff.com/orders/mgm
Pass these on to fellow campsite users.
Each one that is acivated and topped up will earn you a fiver plus a fiver bonus crdit for theperson activating.