The rise in popularity of pay-as-you-go mobile services has now extended to mobile broadband, with news that Vodafone has launched its first pre-pay USB modem.

The “TopUP and Go” 3.6Mbps modem costs £39 and comes with a £15 credit which offers 1GB of data. Good news: purchased data doesn’t expire after 30 days.

Customers simply use a voucher or call a phone number (08080 101238) to buy additional data…