Serbia
eSIM.Fast 5G data plans. Instant activation, no SIM swap.

The best Serbia eSIM solves a problem most travellers only discover at the border: Serbia is not in the EU, so roam-like-at-home allowances from a European SIM stop working the moment you cross from Hungary, Croatia or Bulgaria, and you revert to non-EU roaming rates. Flysimio runs on Telenor, one of Serbia's three operators alongside Telekom Srbija and A1, with 5G in Belgrade and Novi Sad and solid 4G along the national road corridors. Plans are prepaid with no contract, your QR code arrives by email within seconds, every plan includes free mobile hotspot, and there's a 7-day money-back guarantee.

Getting online in Serbia takes about two minutes. Confirm your phone supports eSIM — iPhone XS (2018) and newer and most Android flagships from 2020 qualify. Choose your Serbia plan on Flysimio and pay with card, Apple Pay, or Google Pay; your QR code arrives by email within seconds. On Wi-Fi before you travel, open Settings → Cellular → Add eSIM (iPhone) or Network & Internet → SIMs → Add eSIM (Android) and scan it. The important timing note: if you're driving or taking the bus in from Hungary, Croatia or Bulgaria, switch the Serbian line on before you cross rather than after, so you're never briefly roaming at non-EU rates.

A week between Belgrade and Novi Sad runs 2–3 GB for most travellers — roughly 300 MB a day covers maps, messaging and email, and Serbian cafés and hotels have widespread free Wi-Fi. A 3 GB plan suits a week; 5 GB comfortably covers a fortnight taking in the mountains. Coverage is good across the places people actually go: Belgrade's centre, Kalemegdan Fortress and the Savamala district, Novi Sad and the Petrovaradin Fortress that hosts EXIT, plus the Zlatibor and Kopaonik resort areas. It thins on the southern back roads and the Tara forest trails, so download offline maps if you're driving beyond the main corridors.

Flysimio runs as a second line beside your usual SIM, so you keep your home number for calls and texts while your Serbian data flows over the eSIM — standard dual-SIM behaviour on iPhone XS and later and most Android phones from 2018. Set the Flysimio eSIM as your cellular-data line and turn on Data Roaming for that line only, and — this matters more in Serbia than in most places — turn Data Roaming off on your home line. A European SIM left roaming here is not covered by EU allowances and can run up charges quickly.

Every Flysimio Serbia plan includes mobile hotspot at no extra cost and without throttling, so you can tether a laptop or share with a travel companion. As a data-only eSIM it has no Serbian phone number, but WhatsApp and Viber are both widely used across Serbia and the Balkans, and FaceTime and Google Meet handle calls over data. Your home number stays reachable on your primary SIM. Belgrade has become a significant remote-working hub, and the combination of cheap data, hotspot included and 5G in the centre makes it a practical base.

For a few days in Belgrade, the 1 GB / 7-day plan is the economical choice. For a week or more adding Novi Sad, Zlatibor or the Kopaonik ski resort, a 3–5 GB plan gives you room to navigate and upload without watching a meter, and 10 GB suits a longer remote-working stay. Because Flysimio gives you six months to activate, you can buy before you leave and validity only starts when your eSIM first connects in Serbia. If your route also covers Bosnia, North Macedonia or Montenegro — none of which are in the EU either — check whether a regional plan covers the whole trip before buying country plans separately.