More than ten million users, or roughly 20% of its total subscriber base, have signed up to NTT DoCoMo’s flat-rate mobile internet access services, the company said in a statement. The cellco says that its fixed monthly unlimited access plans have ‘attracted great popularity by freeing users from concerns about data charges when enjoying data-intensive services’. DoCoMo is luring customers onto the flat-rate plans in a bid to encourage them to start using other revenue generating services such its music download service. The operator’s entry level flat-rate plan costs USD34 per month and gives users access to a range of services including e-mail and instant messaging. Full mobile internet access (via a handset) costs USD50 a month.