Which carriers matter, what buying a SIM involves, and when an eSIM is the smarter move.
Reliable mobile internet at better prices than most travel eSIMs, with polished iOS and Android apps and support for making and receiving phone calls.
One of the biggest travel eSIM brands, with a very large destination catalog.
Known for unlimited-data plans in many destinations, at a higher price per gigabyte.
If you buy a SIM at a kiosk, do not insert it into your phone before registering: an unregistered kiosk SIM put into a handset gets invalidated in the operator's system, so take it to a store with your passport first. Montenegro is not in the EU, so EU roam-like-at-home does not apply and an EU SIM roams here at international rates; local tourist packs do, however, include Western Balkans roaming covering Serbia, Bosnia, North Macedonia, Albania and Kosovo. The headline allowances (500 GB, 1 TB) are effectively unlimited, so pick a pack by validity (15, 30 or 45 days) rather than gigabytes. Signal weakens in Durmitor and the northern mountains, where Telekom is the safer choice.
The widest overall coverage and the best in mountain regions like Durmitor, with well-developed 5G. Also sells the cheapest bare SIM, around EUR 5.
Solid on the coast and in the cities.
Particularly strong in rural regions and the cheapest tourist entry point on the market.
Required by law and enforced at the counter: show a passport or ID card and the shop staff handle the registration electronically on the spot. m:tel additionally asks for a selfie along with your ID, including for its eSIM, with the online check taking about 2 to 3 minutes.
Most travel eSIM providers have limited coverage in Montenegro, so a local SIM from one of the carriers above is usually the more reliable option. Check your provider's coverage list before you buy.
SIM cards and eSIM in Montenegro