Hi there Micro,
Welcome to the Vodafone eForum, we are a friendly bunch and a very knowledgeable lot too.
If you have a GPRS signal, you will still connect to the internet, however the speeds will be dramatically reduced and it won’t be at broadband speeds.
You can also top up the mobile broadband via your credit card or indeed via a voucher in store.
You will indeed be able to use the modem with Linux, however you will need to download the drivers from www.betavine.co.uk
If you need anything else please let me know and I will be happy to help you.
Thanks
Matt
eForum Team