France   / Paris Charles de Gaulle Airport

Paris Charles de Gaulle Airport sprawls across 32 square kilometres with three terminal complexes, seven Terminal 2 sub-halls (2A through 2G), and a free automated rail loop connecting them all. The moment your wheels touch the tarmac at Roissy, your phone becomes the single tool coordinating everything: the RER B live departure board showing the next train to Châtelet-Les Halles in 8 minutes, the WhatsApp thread with your Airbnb host confirming the door code, the Uber app pinging your driver's arrival at the Terminal 2E Gate 3 pickup zone.

CDG's free WiFi network exists but requires captive-portal registration that adds friction when you're jet-lagged and the immigration queue is moving. With an eSIMno plan for Paris Charles de Gaulle Airport, you bypass that entirely — your phone connects to Bouygues, Orange, or SFR the instant airplane mode switches off. Gate-change alerts push through while you're still taxiing. Google Translate handles the French customs officer's question about your stay length. Citymapper loads the fastest route from CDG Terminal 1 to your hotel near Opéra before you've cleared baggage claim.

The CDGVAL people mover runs every 4 minutes between terminals, but transfer times still hit 20-30 minutes between Terminal 1 and Terminal 2G — real-time platform countdowns on your phone beat wandering the wrong direction. If your connection routes through the TGV station inside Terminal 2, live SNCF departure boards load on your screen while you're still walking the tunnel from Hall K. Every minute saved on navigation is a minute you're not sprinting past the Ladurée macaron counter to make your Lyon train.

CDG operates 24 hours with flight arrivals and departures clustered between 06:00-23:00 for most carriers. Terminal 1 serves Star Alliance (Lufthansa, United, Singapore Airlines, Turkish Airlines); Terminal 2A handles Oneworld (British Airways, American Airlines); Terminal 2E Halls K, L, and M host Air France long-haul and SkyTeam partners including Delta and Korean Air; Terminal 3 covers low-cost carriers like easyJet, Vueling, and Transavia. The CDGVAL loop and Navette N1 shuttle buses connect all terminals free of charge.

Baggage storage by Bagages du Monde at Terminal 2E runs €10-20 per item daily. Travelex currency counters operate in every terminal, though the euro ATMs inside the RER B station often have shorter queues. The Yotelair transit hotel inside Terminal 2E Hall L offers airside short-stay rooms if your layover stretches past 4 hours. For arrivals heading into Paris, the RER B to Gare du Nord takes 30 minutes at €11.80; the Roissybus to Opéra runs 60-75 minutes at €16.60; night buses N140 and N143 cover the 00:30-04:30 window when the RER B sleeps.