Nutshell Mobile(uses 3)
http://www.nutshellmobile.co.uk/ Nutshell is a Mobile Virtual Network Operator license holder in the UK. Nutshell Mobile is pioneering a refreshing new approach to the mobile market.
http://www.thephone.coop/residential/mobile The Phone Co-op is a British telecommunications co-operative, which operates under self-imposed environmental and ethical guidelines. It provides telephone and internet services, including web hosting and broadband to private customers, charities and other co-operatives
Smarter Mobile(uses 3)
http://www.smartermobile.com/ Smarter Mobile is a mobile and wireless solutions company and we provide totally independent, vendor-neutral mobile and wireless assessment solutions for large, medium and small sized corporations