Greek mobile data is one of the best-value services in Europe — local SIM cards offer 50GB-unlimited plans for €15-30 valid for 30 days, eSIM options work on most modern smartphones, and free public WiFi covers Plaka, Syntagma, Acropolis, the airport, the Metro stations, and most hotels and cafes. The single best option for most short-trip visitors is a 30-day eSIM from Holafly, Airalo, or Orange Holiday Europe (€15-40 for 7-30 days; activates in 5 minutes; no physical SIM swap). For longer stays the local Cosmote, Vodafone, or Nova prepaid plans deliver excellent value. This is the complete Athens SIM card WiFi internet tourists guide for 2026 with the best options by trip length, prices, and where to buy.
Quick Recommendation
Trip 3-7 days, modern smartphone: Holafly or Airalo eSIM. €15-30; activate before travel; no physical SIM swap.
Trip 7-14 days: Orange Holiday Europe eSIM. €20-40; works across Europe.
Trip 14+ days: local Greek SIM card. €15-30 for 30-day prepaid.
EU residents: use your home SIM (free roaming under EU “Roam Like at Home”).
Light usage only: rely on free WiFi (Plaka, Syntagma, hotels, cafes, airport).
For broader context, see our Athens Trip Planning pillar, our airport guide, and our getting around guide.
eSIM Options (Best for Modern Smartphones)
eSIM (embedded SIM) lets you activate a local data plan on your phone without swapping the physical SIM card. Works on iPhone XS and later, most Android phones from 2020+, Google Pixel 3+, Samsung Galaxy S20+.
1. Holafly
Unlimited data plans €19-49 for 7-30 days. One of the most-popular tourist eSIMs. Strong Athens 4G coverage. Activate via app before travel; the QR code arrives by email. Customer support 24/7 in English. The simplest option.
2. Airalo
5-20GB plans €5-25 for 7-30 days. Cheapest eSIM provider. Pay-as-you-need data; more affordable than Holafly’s unlimited plans for casual users. The Greek “Athena Mobile” eSIM is the dedicated option.
3. Orange Holiday Europe
20-50GB plans €20-50 for 14-30 days. The European telecom giant’s tourist eSIM works across all EU countries plus UK, Switzerland, and a few others. Best for multi-country European trips.
4. Saily
1-20GB plans €4-30 for 7-30 days. NordVPN’s eSIM brand. Good user reviews; reliable connections.
5. Nomad
3-20GB plans €5-30 for 7-30 days. Affordable eSIM with strong Greek coverage.
Physical SIM Cards (For Longer Stays or No eSIM Support)
Cosmote (the Largest Greek Carrier)
€15-30 for 30-day prepaid. Cosmote has the broadest 5G coverage in Athens. Plans include 50GB-unlimited data plus Greek calls and texts. Available at the Cosmote shop in Syntagma Square, the airport, and 100+ Athens locations. Bring passport for SIM registration (required by Greek law).
Vodafone Greece
€15-30 for 30-day prepaid. The second-largest Greek carrier. Similar pricing and coverage to Cosmote. Available at the airport, major Athens shopping streets, and the Ermou Vodafone flagship.
Nova Wind
€10-25 for 30-day prepaid. The third major Greek carrier. Slightly cheaper than Cosmote/Vodafone with similar coverage in central Athens.
Free WiFi in Athens
Athens International Airport
Free unlimited WiFi throughout the terminal. Connect to “ATH_FREE_WIFI”; no registration; no time limit.
Athens Metro & Tram
Free WiFi at all major Metro stations (Syntagma, Monastiraki, Acropolis, Omonia, Piraeus). Connect to “STASY_FREE_WIFI”; brief registration.
Athens Public WiFi (Athens WiFi)
Free WiFi in central Athens public spaces including Syntagma Square, Plaka, Monastiraki Square, Thiseio, Kolonaki Square. Connect to “Athens WiFi”; brief registration.
Hotels & Restaurants
Essentially all Athens hotels and cafes have free WiFi. Restaurant WiFi typically requires asking for the password.
Cafes
Free WiFi at Starbucks, Caffe Vergnano, Mokka, Da Capo, and the vast majority of Athens cafes. Usually no password required; sometimes minimum purchase required.
Public Buildings
The National Library, the major museums (Acropolis Museum, National Archaeological Museum, EMST, Benaki), and the public libraries all have free WiFi.
How to Activate an eSIM (Step-by-Step)
1. Purchase the eSIM on the operator’s website (Holafly, Airalo, etc.) using the destination “Greece” or “Europe”.
2. Receive the QR code by email (immediate).
3. On your phone, go to Settings → Mobile Data → Add eSIM (iPhone) or Settings → Connections → SIM Manager → Add eSIM (Android).
4. Scan the QR code from your email.
5. The eSIM installs; you can now switch between your home SIM and the Greek eSIM in Settings.
6. When you arrive in Athens, switch the data line to the Greek eSIM; the data plan activates automatically.
Total setup time: 5-10 minutes.
How to Buy a Physical SIM at Athens Airport
Vodafone, Cosmote, and Nova all have shops in the Athens International Airport arrivals area (level 0). Look for the kiosks near the baggage claim or in the airport shopping mall (level 1). Bring your passport (required by Greek law for SIM registration). Activation takes 15-30 minutes. Cost: €15-30 for a 30-day prepaid plan with 50GB+ data.
How to Buy a Physical SIM in Central Athens
The major Athens shopping streets have all three carrier flagships:
Cosmote: 21 Stadiou Street (Syntagma).
Vodafone: Ermou flagship plus multiple Athens locations.
Nova: several locations including Ermou and Patission Street.
Bring your passport; allow 15-30 minutes for SIM registration and activation.
EU Roaming (For EU Residents)
EU residents from the 27 EU countries plus Iceland, Liechtenstein, and Norway benefit from “Roam Like at Home” — your home country mobile plan works in Greece at home prices. No eSIM or local SIM needed. UK residents (post-Brexit) check with your carrier; some still offer free EU roaming, others charge.
5G in Athens
Cosmote and Vodafone both offer 5G coverage in central Athens. Most newer eSIMs and local SIMs include 5G access at no extra charge. 5G speeds in central Athens typically 200-500 Mbps download; older 4G areas still deliver 50-150 Mbps.
Data Usage Reality for Tourists
Light use (maps, messaging, email): 1-3GB per week.
Moderate use (maps + streaming + video calls): 5-15GB per week.
Heavy use (continuous streaming + video calls): 20-50GB per week.
For most tourist trips, 5-20GB is plenty. The Holafly unlimited or Airalo 20GB options cover any reasonable usage pattern.
Tips for International Calling
WhatsApp calls: the standard. Free over WiFi or mobile data.
FaceTime: works fine for iPhone-to-iPhone calls.
Google Voice (if you have it): free international calls from US to Greek numbers.
Calling Greek local numbers from your phone: use the Greek country code +30 followed by the 10-digit number.
The Greek emergency number: 112 (works for police, fire, ambulance; English-speaking operators).
Useful Athens-Specific Apps
Google Maps: works well in Athens including walking directions.
OASA Telematics: the official Athens public transport app with real-time bus and tram arrivals.
Bolt / Uber: for taxi alternatives.
Beat: the Athens-native taxi app; often the most reliable for Greek-language taxi calls.
Hellenic Seaways / OpenSeas: for Greek-island ferry bookings.
Google Translate: useful for menus and signs.
XE Currency or Revolut: for exchange rate and digital payments.
Common Mistakes
Not bringing your phone PIN/passcode: some eSIM activations require your phone’s lock code.
Not bringing passport for physical SIM: Greek law requires passport ID for SIM registration; even kiosks at the airport require it.
Buying overpriced “tourist SIMs” at airport kiosks: shop around; major carrier prices €15-30 for 30 days.
Forgetting to switch back to home SIM at end of trip: the eSIM stays on your phone until you delete it; you can switch back to your home plan in Settings.
Connecting to unsecured WiFi for sensitive transactions: use VPN for banking and email on public WiFi.
Frequently Asked Questions
Do I need a SIM card for Athens?
Yes for reliable mobile data — Athens has excellent free WiFi but you’ll want mobile data for maps, taxis, and out-and-about messaging. For trips 3-7 days, an eSIM (Holafly, Airalo) is the easiest option €15-30. For trips 14+ days, a local SIM (Cosmote, Vodafone) is the best value €15-30 for 30 days.
What is the best eSIM for Athens?
Holafly for the easiest activation and unlimited data (€19-49 for 7-30 days). Airalo for the cheapest option (€5-25). Orange Holiday Europe for multi-country European trips (€20-50 for 14-30 days). All work on modern smartphones with eSIM support.
How much does a Greek SIM card cost?
€15-30 for a 30-day prepaid plan with 50GB+ data, calls, and texts. Available at the airport (Cosmote, Vodafone, Nova kiosks) or at the carrier flagship stores in central Athens. Bring passport for SIM registration.
Is there free WiFi in Athens?
Yes throughout the central tourist areas. Free WiFi at the Athens airport, the Metro stations, central squares (Syntagma, Plaka, Monastiraki, Kolonaki), all hotels and most cafes. Network names: ATH_FREE_WIFI (airport), STASY_FREE_WIFI (Metro), Athens WiFi (public squares).
Does my US/UK phone work in Athens?
Yes if it’s unlocked. eSIM-capable phones can install a Greek eSIM. Physical SIM-only phones can swap in a Greek SIM. Most US carriers (T-Mobile, AT&T, Verizon) offer international roaming options €5-15 per day; check your carrier’s plans before travel.
Can EU residents use their home plan in Athens?
Yes. EU residents from 27 EU countries plus Iceland, Liechtenstein, Norway have “Roam Like at Home” — your home mobile plan works in Greece at no extra cost. UK residents (post-Brexit) check with carrier; some still offer free EU roaming.
What is the Greek emergency phone number?
112 (European emergency number; works for police, fire, ambulance; English-speaking operators). Specific Greek numbers: 100 (police), 166 (ambulance), 199 (fire), 1571 (Tourist Police).
The Greek Mobile Market Reality
Greek mobile telecommunications is one of the best-priced and best-quality in Europe. The market has three major operators:
Cosmote: the OTE (Greek incumbent telecom) mobile arm; the largest network with the broadest coverage including remote islands.
Vodafone Greece: the international Vodafone Greek subsidiary; strong 5G coverage in central Athens.
Nova Wind: the third operator; slightly cheaper pricing; similar coverage in central areas.
The result: aggressive pricing competition keeps prepaid plans cheap. Standard Greek consumer plans offer 50GB-unlimited data for €15-30/month — significantly cheaper than equivalent UK, German, or American plans.
eSIM Detailed Provider Comparison
Holafly
Pricing: €19 for 5 days unlimited; €27 for 7 days; €34 for 10 days; €47 for 15 days; €54 for 20 days; €64 for 30 days.
Advantages: truly unlimited data; reliable connection; 24/7 English customer support; simplest activation.
Disadvantages: more-expensive than competitors; data isn’t fast 5G everywhere.
Best for: heavy data users; visitors who value simplicity.
Airalo
Pricing: 1GB €5; 3GB €11; 5GB €13; 10GB €18; 20GB €30; 50GB €60.
Advantages: cheapest option; pay only for data you need.
Disadvantages: capped data; need to monitor usage; less-aggressive customer service.
Best for: light to moderate data users.
Orange Holiday Europe
Pricing: 20GB for 14 days €20; 50GB for 30 days €50.
Advantages: works across all EU countries plus UK; consistent pricing.
Disadvantages: only 14 or 30 day options.
Best for: multi-country European trips.
Saily (NordVPN)
Pricing: 1GB €4; 5GB €13; 10GB €22; 20GB €30.
Advantages: good user reviews; reliable.
Disadvantages: capped data.
Nomad
Pricing: 3GB €7; 10GB €18; 20GB €30.
Advantages: affordable; strong Greek coverage.
How to Choose Between Providers
For 3-7 day trip with moderate usage: Airalo 5-10GB €13-18.
For 3-7 day trip with heavy streaming: Holafly unlimited 7 days €27.
For 14-30 day trip: Orange Holiday Europe €20-50 (multi-country bonus).
For 30+ day trip: physical Greek SIM €15-30 (best long-term value).
Physical SIM Card Process at Athens Airport
For visitors preferring physical SIMs:
At the Airport
Cosmote, Vodafone, and Nova all have shops in Athens International Airport arrivals area (level 0):
Location: kiosks near baggage claim or in the airport shopping mall (level 1).
Required: passport (Greek law requires SIM registration).
Activation time: 15-30 minutes.
Plans: 30-day prepaid with 50GB+ data for €15-30.
In Central Athens
The carrier flagship stores:
Cosmote: 21 Stadiou Street (Syntagma).
Vodafone: Ermou flagship plus multiple Athens locations.
Nova: several locations including Ermou and Patission Street.
Same process: passport required; 15-30 minutes activation.
Free WiFi: Detailed Locations
Athens International Airport
Network name: ATH_FREE_WIFI
Registration: none required.
Time limit: unlimited.
Speed: 10-30 Mbps typical.
Coverage: entire terminal including all gates.
Athens Metro & Tram
Network name: STASY_FREE_WIFI
Registration: brief (email).
Coverage: all major Metro stations (Syntagma, Monastiraki, Acropolis, Omonia, Piraeus, Akropolis); tram interchanges; major bus stations.
Speed: 5-15 Mbps typical; sufficient for messaging and maps.
Athens Public Squares
Network name: Athens WiFi
Registration: brief.
Coverage: Syntagma Square, Plaka, Monastiraki Square, Thiseio, Kolonaki Square, several other central squares.
Coverage limit: only in the central squares; doesn’t extend to side streets or restaurants.
Hotels & Cafes
Universal coverage: essentially all Athens hotels and cafes have free WiFi.
Hotel WiFi: typically included in room rate; sometimes requires room number for activation.
Restaurant WiFi: typically requires asking for the password.
Speed: varies wildly; 5-100 Mbps depending on venue.
Museums & Cultural Venues
All major museums: Acropolis Museum, National Archaeological Museum, EMST, Benaki, Cycladic Art Museum.
The National Library at SNFCC: free WiFi with strong infrastructure.
The major public libraries: free WiFi.
eSIM Activation Step-by-Step
Before Travel
1. Purchase on operator website (Holafly, Airalo, etc.) using “Greece” destination.
2. Receive QR code by email (immediate delivery).
3. Verify your phone supports eSIM (iPhone XS and later; most Android 2020+; Samsung Galaxy S20+).
On Arrival (or in Advance)
4. Open phone Settings → Mobile Data → Add eSIM (iPhone) or Settings → Connections → SIM Manager → Add eSIM (Android).
5. Scan the QR code from your email.
6. The eSIM installs as a second line on your phone.
7. Choose data line preferences in settings (Greek eSIM for data; home SIM for calls if desired).
8. Test the connection by browsing or sending a message.
Total Activation Time
5-10 minutes for the entire process. Test the connection before relying on it.
5G Coverage in Athens
Athens has good 5G coverage:
Cosmote 5G: covers central Athens, Athens Riviera, and most major neighbourhoods. 200-500 Mbps typical.
Vodafone 5G: similar coverage; competitive speeds.
Nova 5G: growing coverage; smaller footprint than the two leaders.
4G fallback: consistently strong throughout greater Athens; 50-150 Mbps.
The eSIMs (Holafly, Airalo, Orange) connect to Cosmote or Vodafone networks; 5G access included on most plans.
Data Usage Calculator
For estimating your trip data needs:
Maps and navigation: 100-200 MB/day.
Email and messaging: 50-100 MB/day.
Social media browsing: 200-500 MB/day.
Photo/video sharing: 100-500 MB/day depending on volume.
Voice calls via WhatsApp: 50-100 MB/hour.
Video calls via WhatsApp/FaceTime: 400-800 MB/hour.
Music streaming: 60-150 MB/hour.
Video streaming (low quality): 250-500 MB/hour.
Video streaming (HD): 1-3 GB/hour.
For most tourist visits: 5-15GB total for a week is sufficient. Heavy social media or video streaming may push to 20-30GB.
International Calling Strategies
Free Options
WhatsApp: calls free over WiFi or mobile data; the standard for international calling.
FaceTime: iPhone-to-iPhone calls free over data.
Google Meet, Zoom: video calls free.
Skype: Skype-to-Skype calls free; Skype-to-phone has small per-minute charges.
Paid Options
Google Voice (US users): very low per-minute rates to international numbers.
Skype Phone Credit: €5-25 of credit for calls to international landlines and mobiles.
Standard cellular international calls: typically €0.50-2.00 per minute via your home plan’s roaming option (expensive; avoid).
Calling Greek Numbers
Within Greece: dial the 10-digit number directly.
From outside Greece: dial +30 followed by the 10-digit number.
The Greek country code: +30.
Athens-area landlines: begin with 21.
Mobile numbers: typically begin with 69.
Athens-Specific App Reference
Essential
Google Maps: works excellently in Athens including walking directions, public transport routing, and real-time traffic.
OASA Telematics: the official Athens public transport app with real-time bus and tram arrivals. Free; in English.
Bolt: taxi app; reliable.
Uber: taxi app (operates with regular taxis, not private cars in Greece).
Beat: the Athens-native taxi app; the most-popular among Athenians; often the most-reliable for Greek-language address calls.
Highly Recommended
Google Translate: useful for menus and signs; the camera-translation feature works on Greek text.
WhatsApp: the standard messaging app in Greece.
OpenSeas or Hellenic Seaways: for Greek-island ferry bookings.
XE Currency or Revolut: for exchange rate and digital payments.
Optional
TripAdvisor: restaurant and attraction reviews.
The Fork: restaurant bookings.
GetYourGuide / Viator: tour bookings.
Hellenic Train: for railway bookings.
Phone Storage & Battery Management
For Athens travel:
Storage: photographers should clear phone storage before travel; budget 50-200 photos per day = 500-2,000 MB.
Battery: the heavy sightseeing days drain phones quickly. Bring portable battery pack (5,000-10,000 mAh).
Cable: bring two charging cables (one in day pack; one in hotel).
Adapter: European Type C/F adapter for non-EU travellers.
Greek SIM Card Pricing 2026 Specifics
Standard Greek prepaid SIM plans (2026):
Basic plan: €10 for 5GB + 100 minutes; 30 days validity.
Mid plan: €15 for 20GB + 200 minutes; 30 days.
Premium plan: €25 for 50GB + 500 minutes; 30 days.
Heavy data plan: €30 for 100GB + unlimited Greek calls; 30 days.
EU roaming included: standard plans include data roaming throughout EU at home prices.
Common Connectivity Mistakes
Not bringing phone PIN/passcode (some eSIM activations require), not bringing passport for physical SIM (Greek law required), buying overpriced “tourist SIMs” at airport kiosks (the major carriers price the same €15-30 plans), forgetting to switch back to home SIM at end of trip (the eSIM stays on phone until deleted), connecting to unsecured WiFi for sensitive transactions (use VPN), running out of data mid-trip (estimate generously; budget 20% extra over your calculated need).
VPN Considerations
For visitors wanting added security:
VPN benefits: encrypts traffic; protects against public WiFi snooping; allows access to home-country streaming services.
Recommended VPNs: NordVPN, ExpressVPN, Surfshark. €3-10 per month.
When to use: public WiFi (hotels, cafes, airports); banking and sensitive transactions.
When not needed: private mobile data is encrypted by the cellular standard.
Plan the Rest of Your Athens Trip
For more planning content, see our Athens Trip Planning pillar, our packing list, our safety guide, our getting around guide, and our airport guide.