Question about the offer received

Hi,

i have received an offer from nos for tv net voz for a good value. But i have some clarifications.

In the offer they say

1. Ofertas: Oferta de Telefone Sem Fios - 24,90 durante 1 Mes
2. Oferta de Pack de Canais Tematicos - 10,00 durante 3 meses

Does it mean i have to add 24,90 to my monthly bill from second month and i have to add 34,90 after 3 months?.

Am i understanding anything wrong?. Please clarify.