Free eSIM for Bulgaria: Try co:sim's Free Trial

If you're weighing a free eSIM for a trip to Bulgaria, co:sim currently gives new users 1 GB of data valid for 7 days from first connection, usable across 33 European countries including Bulgaria, for $0 at checkout. It installs the same way a paid co:sim plan does: a QR code by email, ready before you land at Sofia, Varna, or Burgas airport. It's a natural companion to co:sim's existing Bulgaria buying guide, sized for travelers who want to test the eSIM before committing to a bigger plan, or who just need a short-trip data connection without a SIM-counter queue.

This guide covers who Bulgaria's free trial actually fits, which visitors get the most value from it, what networks the eSIM connects to, and exactly how to claim and reload the offer before you go.

#Who is co:sim's free eSIM for Bulgaria actually right for?

The free trial fits a specific set of trips well. A long weekend in Sofia, a Black Sea coast stopover in Varna or Burgas, or a first-time eSIM user confirming their phone works before buying a bigger plan are all good matches. It also works as a backup line alongside your regular carrier's roaming, giving you a second way online if one connection drops.

It's a poor fit for anything longer or heavier on its own. A two-week trip mixing Sofia, Plovdiv, and the coast, a remote-work stay, or a traveler streaming video and hotspotting a laptop will burn through 1 GB in a day or two. That doesn't mean starting over: because the plan is reloadable, you top up the exact same eSIM with more data mid-trip instead of claiming a fresh profile. Treat the free week as a taste test, then extend it or move to a bigger paid plan once you know what your trip actually needs.

#Which visitors get the most value from Bulgaria's free eSIM?

Bulgaria welcomed 13,608,246 foreign visitors in 2025, according to travel industry reporting citing Bulgaria's National Statistics Institute. Romania and Turkey were the two largest source markets, each sending roughly two and a half million visitors, followed by Greece, Germany, and Ukraine. EU countries together accounted for 55.7% of arrivals — but Turkey, Bulgaria's second-largest source market by volume, sits outside the EU entirely, and Ukraine, its fifth-largest, does too. Neither gets the EU's "Roam Like at Home" free-roaming allowance in Bulgaria, unlike a visitor arriving from Romania or Greece.

The same reporting notes the UK sent around 343,000 visitors to Bulgaria in 2025 and the US around 49,000 — smaller in absolute terms than Turkey or Ukraine, but both also outside the EU roaming zone, and both groups whose home carriers typically charge for data use in Bulgaria rather than including it. For any of these non-EU/EEA visitor groups, a free eSIM claimed before departure replaces a real roaming cost, not just a convenience already covered by a home plan.

#What mobile networks will you connect to in Bulgaria?

Bulgaria runs on three national mobile networks: A1, Vivacom, and Yettel. All three maintain broad 4G coverage across the country, and 5G is actively expanding — Yettel's own announcement of its latest rollout puts its 5G network at 86% of the Bulgarian population, built out with close to 100 new base stations and upgrades to more than 1,000 existing ones over the preceding year. co:sim's free eSIM, like every co:sim plan, connects automatically to this same mainstream infrastructure rather than a separate, lower-tier network.

Coverage is strong in Sofia, Plovdiv, and along the Black Sea coast resorts most visitors actually reach, with the usual thinner signal in the more remote parts of the Rhodope and Balkan mountain ranges — a gap that affects every operator, not something specific to any one eSIM.

#How do I claim and install co:sim's free eSIM for Bulgaria?

The offer is straightforward: 1 GB of data, valid for 7 days starting from your first connection (not from the moment you claim it), usable across Bulgaria and 32 other European countries on one eSIM profile. You provide an email at checkout, and the QR code plus install instructions arrive within seconds.

A valid card is collected at checkout for identity verification, to stop one person claiming multiple free eSIMs under different emails. Nothing is charged. That's standard practice for $0 offers industry-wide, not a co:sim-specific catch, worth knowing so the request doesn't feel like a bait-and-switch.

You have 30 days from claiming the offer to install and activate it. Install it before you fly using your phone's Settings menu, and it sits ready until you land and connect for the first time in Bulgaria, which is when the 7-day clock actually starts. If your trip runs longer or you want more data, the same eSIM tops up from your account dashboard rather than needing a fresh profile or a second install.

Claim co:sim's free eSIM for Bulgaria →

#Is 1 GB enough data for a trip to Bulgaria?

For maps, messaging apps, and light browsing over a long weekend in Sofia or on the coast, 1 GB is usually enough. It gets tight fast with video calls, music or video streaming, or hotspotting a laptop — an hour of standard-definition streaming can use 700 MB to 1 GB on its own, so one long bus ride spent watching something can burn the entire allowance.

Here's how the free trial compares to sizing data for a longer or heavier Bulgaria trip:

That last row matters most for the roughly 44% of Bulgaria's visitors arriving from outside the EU, led by Turkey and Ukraine. Those travelers don't get the EU's free-roaming allowance in Bulgaria at all, so whatever their home carrier charges for international data applies from the moment they land — exactly the gap a free or paid Bulgaria eSIM closes.

#FAQ

#Does co:sim's free eSIM work outside Sofia, across the rest of Bulgaria?

Yes. The free eSIM runs on Bulgaria's mainstream mobile infrastructure — A1, Vivacom, and Yettel — the same networks that carry co:sim's paid Bulgaria plans, rather than a separate, lower-tier network. Coverage is strong in Sofia, Plovdiv, and the Black Sea coast resorts most travelers actually visit, with the usual thinner signal in remote mountain areas like the Rhodopes that affects every operator equally. It's not a Sofia-only offer; it works anywhere in Bulgaria your phone would normally pick up a mobile signal.

#Why would a Turkish or Ukrainian visitor need a Bulgaria eSIM if they're arriving by land?

Turkey and Ukraine are Bulgaria's second- and fifth-largest source markets by visitor volume according to 2025 tourism reporting, and many of those trips are short land crossings rather than flights. Distance doesn't change the roaming picture, though: neither Turkey nor Ukraine is an EU or EEA member, so a Turkish or Ukrainian SIM gets no "Roam Like at Home" allowance once it connects to a Bulgarian network, the same as it wouldn't for a flight from further away. A free co:sim eSIM installed before crossing the border gives that data connection at $0, with no home-carrier roaming charge involved at all.

#Is co:sim's free eSIM for Bulgaria really free, or will I be charged later?

The order total is $0, and nothing is billed after checkout. A card is collected at the point of claiming purely to verify you're a real, unique person who hasn't already claimed the same offer under a different email; this identity check is standard across the free-trial industry, not a delayed-charge mechanism specific to co:sim. Because the total is $0, the free eSIM sits outside co:sim's standard refund window the same way any free item does — there's simply no charge to refund. It carries a real 30-day install-and-activate deadline from the moment you claim it, after which an unused offer is automatically cancelled the same way an unused paid eSIM would be past its own deadline.

#Can I extend the free eSIM instead of claiming a new one when it runs out?

Yes. co:sim's free eSIM for Bulgaria is reloadable, meaning the same installed profile keeps working after you add more data or extend its validity rather than expiring into a dead end. Once the free 1 GB or the 7 days runs out, whichever comes first, you top up the existing eSIM with a paid data package from your account dashboard, and it picks up where the free trial left off on the same connection — no new QR code, no second profile taking up a slot on your phone. This matters most for a trip that grows past the original plan, whether that's a longer Bulgaria stay or one that extends into a neighboring country on the same 33-country plan.

#How is this different from co:sim's Bulgaria buying guide?

co:sim already publishes a full buying guide covering paid Bulgaria eSIM plans, network coverage, and pricing in more depth. This article is specifically about the free 1 GB / 7-day trial: how to claim it, who it genuinely fits, and when it's time to move to a paid plan instead. If you already know you need more than a short trial's worth of data, the paid guide and co:sim's Bulgaria plans page are the better starting point; if you want to try co:sim before committing to anything, this offer is the lower-risk first step.

#Do I still need a local SIM card if I claim the free eSIM?

No, not for data. The free eSIM is a complete, working data connection on its own: installed as a QR code before departure and activated automatically the moment you land and connect in Bulgaria. It's data-only, meaning it doesn't include a phone number for calls or SMS over the cellular network, but messaging apps like WhatsApp, iMessage, or FaceTime work fine over its data connection, covering most travelers' actual communication needs. The one case where a physical local SIM still matters is if you specifically need a Bulgarian phone number, for example an SMS verification code that won't accept a foreign number. Outside that narrow case, the free eSIM replaces a local SIM for internet access entirely.

Haven't claimed it yet? Claim co:sim's free eSIM for Bulgaria → — the QR code arrives by email within seconds.

Ready to size a plan for the rest of your trip once the free week is over?

Browse co:sim's Bulgaria eSIM plans →