No. It uses the euro and sits in the middle of Europe, but Kosovo is not an EU member and a great many Europe-wide plans leave it off their country list. Before buying, open the actual country list and find the word Kosovo in it. Do not infer it from a headline that says the plan covers Europe, because that phrase and the list often disagree.

Be careful with that leg. Serbia does not treat a Kosovo entry stamp as a lawful entry into Serbia, and travellers who flew into PRN have been turned back at Merdare. The safer plan is to leave the way you came, or to enter Kosovo from the Serbian side first and return through the same crossing. Check current practice close to your travel dates, since it has changed more than once.

It depends on the rental company and the country. Most allow Albania, Montenegro and North Macedonia if you declare it in advance and pay for cross-border cover or a green card, while many refuse Serbia outright. Ask at booking time and get the answer in writing with the insurance document, because the border post will want to see the paperwork rather than hear what the desk agent told you.

The route crosses three borders, so a phone will hop onto Albanian or Montenegrin networks by itself and you can end up roaming across countries without meaning to. Download the trail map offline, switch off automatic network selection if that matters to you, and agree arrival times with each guesthouse in advance, because some days have no usable signal from morning until you walk in.

Most plans here start when the phone first connects to a network at the destination, so you can install in advance at home and switch it on after landing. Each plan page states its own rule.

No. The eSIM is a second line, so you keep your home number for SMS OTP. Turn off roaming data on the home line and set the eSIM as the data line.