This is the big one. If your phone is still under a payment plan, your carrier might have it "locked," meaning it won't accept other SIM cards. Call them to check.
The easiest, but most expensive. Most carriers charge a flat daily fee (like ₹500–₹700) to use your home plan abroad. Great for short weekends; terrible for long trips. 2. The "Pre-Flight" Checklist buying a sim card for overseas travel
If your phone is newer (iPhone 11+ or recent Pixels/Samsungs), you can download an eSIM before you even leave home. Apps like Airalo or Holafly let you buy a data plan for a specific country or region. No physical swapping required. This is the big one