P4, operator of the Play mobile network, has been ordered to stop its current advertising campaign until its court dispute with Polkomtel – the operator of Plus – is over.

Play claims in its TV, radio, press and outdoor advertising campaign that it is cheaper to call customers of Plus, Era and Orange using Play than it is to call them using the customer's own network.

The operator of the Plus mobile network is claiming that the campaign is misleading as, if Play's comparison included all services, calls on Play would not be cheaper.

Comparative advertising is lawful as long as it is not misleading and satisfies certain other requirements. It is even permissible to advertise using a competitor's registered trademark.

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The original publication date for this article was 05/02/2009.