: Most carriers let you top up via their website or app.
: Ensure your phone isn't locked to a carrier. where to buy sim card in paris
: ID is legally required for registration. : Most carriers let you top up via their website or app
: Apps like Airalo or Holafly work instantly without a physical store. 3 days vs. 2 weeks)
Your or train station (CDG, Orly, Gare du Nord) Length of stay (e.g., 3 days vs. 2 weeks)