No, you haven't payed for 3G, you have not selected a Jolla Tablet perk with 3G, because there wasn't that option. There was a strech goal of US$2.5 million to have 3G, i.e., if reached, there would be additional perks with Jolla Tablet 3G and to include 3G capability to previous Jolla Tablet perks. Like Jolla Tablet 32GB->64GB costing US$25.