A useful tip when comparing offers is to first get a free SIM card from your current provider and to check 3G availability in the area where you’re planning to use the mobile broadband.
If you’re going to be using the mobile internet in different locations, then you should bear in mind that connection coverage may vary depending on where you are.
When comparing deals, you may also want to look at the total annual cost you will be paying for a long-term contract deal, so as to have a clear idea of what you’re getting.