If you're in the US, it will be already taken care of by the time you receive your phone. Other countries will need to handle their own import duties.
If we can arrange a distribution partner in the EU before the campaign ends we may add a new reward level which lets backers select an "EU Friendly" pledge. The shipping cost may end up slightly higher, but the import duties would be handled on our side instead of yours. If you or someone you know has a business experienced in importing phones and wants to work with us, please put us in touch.