want a cellphone, any advice on providers?

currently i want a cellphone, a decent one will be fine, any advice on online cellphone provider?

via Forums de téléphone cellulaire (en français) http://cellphoneforums.net/fr/general-service-provider-forum/t363577-veulent-un-t%C3%A9l%C3%A9phone-portable-un-conseil-sur-les-fournisseurs.html