T-Mobile vs Debitel

(Germany) Mobile service reseller Debitel has step up and offer a rebate to consumers, effectively bringing the price of the iPhone back down to its original €399, but on another network. That's a whopping €600 rebate per customer.
It appears that Vodaphone giving T-Mobile a run for their money. Debitel wants a good share too. If you checked out the wiki link, it is stated '47% market share' in Germany.
One wonders if this approach would be adopted in 'France', 'Danmark', 'Nederland' and 'Slovenija' too. Read more here (Ars technica) and here (Reuters) AND here (MY iTablet).