Dear, it have 12 months of standard store warranty + now you can have additional 12 months of warranty in the cart. You can read more here:
https://bludiode.com/en/info/How-looks-process-of-complaint-in-Bludiodecom
https://bludiode.com/en/info/how-do-i-report-a-claim
https://bludiode.com/en/blog/p-free-of-charge-12-months-of-warranty-to-every-device-from-bludiodecom

This phone is brand new, factory unlocked, should work in your country. Still, it might be wise to compare it's LTE/5G frequencies with the LTE/5G frequencies of your network to confirm coverage compatibility.

Dear, we are providing invoice without VAT, you pay VAT by yourself once item will reach the border.

Yes, in case of this one from China. Dear, price of the product does not include tax of your country. You can ask us for a customs custom declaration in the cart process, in "Customs Declaration" field or "Comments" field. But that not always work, it's good to be prepared to pay yours's country tax, when package will arrive. Occurrence of these taxes is not reason for order cancellation.

Dear, value of the declaration is up to you, but we'll always declare as "smartphone" or similiar.

Dear, price of the product does not include tax of your country. In case of UK it's around ~19%. You can ask us for a customs custom declaration in the cart process, in "Customs Declaration" field or "Comments" field. But that not always work, it's good to be prepared to pay yours's country tax, when package will arrive. Occurrence of these taxes is not reason for order cancellation.

Dear, it's Chinese version, but works just fine in the EU.