The UK arm of t-mobile has reversed its ban on VoIP applications on it Web 'n' Walk data service, according to the Register. The Reg says T-Mobile will introduce a Web 'n' Walk Max tariff plan that allows up to 10MB of data and VoIP and possibly instant messaging for £22.50.

T-Mobile and some other operators, such as Verizon and Cingular in the US, have taken a dim view of VoIP over mobile data services, claiming the "poor" quality affected customers' perception of their services. Most analysts agree, however, that the real reason is the fear of cannibalization of voice minutes, the mainstay of operators' businesses. Consumer pressure, and an increasing flow of Wi-Fi-enabled devices are chipping away at this, however.