he is staying in a friends house with no internet he can use it in pubs and restaurants . Zipper do's that adapter work with all tablets and will it recognize a dongle ?
That adapter will fit most Tablets.
But its a pure guess if the software on the tablet will recognise.
1. The Dongle
2. The Data Connection Needed.
If you have the opportunity to go on to the local wifi use that.
Just be security minded.
Don't use passwords.
Don't do any banking or transactions.
If you can tell us the Make of the Tablet and Version we may help more. But Wifi is the more reliable option at the moment.