Travel SIM Card Cost Calculator

Staying connected abroad is one of the most confusing travel expenses. You have three main options, each with very different cost structures.

Option 1 — Roaming with your home carrier Most US, UK, and Australian carriers offer international add-ons. Without an add-on, roaming data can cost $10–$20 per MB — catastrophically expensive. With an add-on:

• T-Mobile Magenta: unlimited roaming in 215+ countries (data throttled to 256 kbps)
• AT&T International Day Pass: $10/day, full home-plan speed
• Verizon TravelPass: $10/day in most countries
• Roaming is convenient but expensive for data-heavy use

Option 2 — Local SIM card Buy a local prepaid SIM at the airport or a phone store. This gives you:

• Local call rates (often free incoming calls)
• Full-speed data at local prices (often 5–20× cheaper than roaming add-ons)
• Typical cost: $5–$30 for 5–30 GB of data for 7–30 days
• Requires an unlocked phone
• May need to show passport for registration in some countries

Option 3 — eSIM (digital SIM) Modern travel solution — no physical SIM swap needed. Providers like Airalo, Holafly, and Nomad offer:

• Airalo: from $5 for 1 GB in most countries
• Holafly: unlimited data plans from $19/7 days
• Ubigi, Nomad: regional and global plans available
• Best for: travelers with newer phones (iPhone XS+, most Android 2020+)

Rule of thumb:

• Under 3 days: carrier day pass is often easiest
• 4–14 days: eSIM usually wins on value
• 15+ days: local SIM almost always cheapest

Data usage reference:

• Social media, light browsing: 100–200 MB/day
• Maps + messaging + email: 200–500 MB/day
• Video calls + streaming: 1–3 GB/day
• Heavy use / hotspot: 3–10 GB/day