(Telecompaper) Dutch mobile providers are not providing enough information on their websites about the details of tariff plans, such as how long credit is valid or the billing method, according to a survey by the consumer group Consumentenbond among 13 providers. The group has been calling for years for more transparency in telecom tariffs to help consumers compare offers. It wants providers to make clear from the start of the online ordering process all the terms of the plan, such as what happens when a data bundle is used up. It also wants a longer period of validity for airtime and all calls to be billed by the second. Its survey found that Ben, MTV Mobile, Simyo, Tele2, T-Mobile, Vodafone and Youfone are less clear about the terms of their offers. The information is available, but only after extensive clicking around the site. Hi, Hollandsnieuwe, KPN, Simpel, Telfort and Ziggo offer more clear information on a pop-up screen at the start of the order process. The group also looked at the new plans introduced by KPN, Hi and Vodafone in early July and found that none of the providers were totally clear about the tariffs and conditions. KPN and Hi have introduced per-second billing on all their new plans, while Vodafone has only one plan with longer credit validity. However, there are still no providers offering both per-second billing and longer airtime validity.