Swedish 3G carrier '3' will offer free in-network calls and data transfer. The move is an attempt to gain market share
"The offer is available for existing and future subscribers who sign up for services starting at 99 Swedish kronor (11 euros, 13 dollars) per month, the telecoms operator said in a statement."
Currently having free in-network calls/data isn't that huge--3 has only 20-30K 3G customers. However, it is likely that these numbers will swell due to the promo.