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

The best Bulgaria eSIM gives you A1, Vivacom and Telenor coverage at a fraction of the unlimited-only alternatives. Bulgaria is one of Europe's better-value destinations and that extends to connectivity — it has consistently strong fixed and mobile internet, with 5G across Sofia, Plovdiv and the major cities, and Sofia has become a genuine remote-working base partly on the back of it. 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. Bulgaria is an EU member, so check whether your existing roam-like-at-home allowance already covers you first.

Getting online in Bulgaria takes about two minutes. Confirm your phone supports eSIM — iPhone XS (2018) and newer and most Android flagships from 2020 qualify. Choose your Bulgaria 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. Switch the line on at Sofia airport and turn on Data Roaming for that line only. Bulgaria uses the Cyrillic alphabet on many road signs, so an offline map with your own language set is worth downloading before you drive anywhere.

A week covering Sofia and Plovdiv runs 2–3 GB for most travellers — roughly 300 MB a day for maps, messaging and email, and Bulgarian cafés and hotels have widespread fast Wi-Fi. A 3 GB plan suits a week; 10 GB makes sense if you're working remotely from Sofia for a month. Coverage is strong where people go: Sofia's centre and metro, Plovdiv's Old Town and Kapana district, the Black Sea resorts, and the ski areas at Bansko, Borovets and Pamporovo. It thins in the Rhodope and Pirin mountain interiors, so download offline maps before hiking or driving the back roads.

Flysimio runs as a second line beside your usual SIM, so you keep your home number for calls and texts while your Bulgarian 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. If you're skiing, one practical note that matters more than settings: cold drains phone batteries fast on a full day on the mountain, so carry a power bank and keep the phone in an inside pocket between lifts.

Every Flysimio Bulgaria plan includes mobile hotspot at no extra cost and without throttling, so you can tether a laptop or share with a travel companion — genuinely useful in Sofia, where a lot of visitors are there to work. As a data-only eSIM it has no Bulgarian phone number, but WhatsApp and Viber are both widely used in Bulgaria, and FaceTime and Google Meet handle calls over data. Your home number stays reachable on your primary SIM.

For a Sofia city break, the 1 GB / 7-day plan is the economical choice. For a week or more adding Plovdiv, Rila Monastery and the Black Sea coast, a 3–5 GB plan is comfortable, and for a ski season or a month of remote work the 10 or 20 GB plans are still inexpensive. Because Flysimio gives you six months to activate, you can buy before you leave and validity only starts when your eSIM first connects in Bulgaria. If your route also crosses into Romania, Serbia, Greece or Turkey, compare the Europe regional plan — though note Serbia and Turkey sit outside EU roaming arrangements.