I have recently moved house and I seem to habe lost the sheet of paper that had the detalis of my service number. I was wondering if there was any way I'd be able to retrieve this information so that I am able to recharge my account? I still have the sim card and the Pocket Wifi device.
Put the SIM back into the Pocket Wifi, turn it on and log on to the management page (http://pocket.wifi).
Go to My Account > Manage your account which will open the My Vodafone login page in a browser. Hopefully, if you've already registered for My Vodafone, and had your cookies enabled, it will display your broadband number.
It's worth checking the Text Messages inbox on the wifi management page. As you should have got an automated SMS on activation, perhaps it's still there.
Otherwise ... make a note of the numbers printed on your SIM - the Vodafone reps should be able to extract your details from those.