eSIM vs Roaming Plans — Real Cost Comparison
International roaming can cost {price.5}–{price.15} per megabyte with some carriers. A single hour of video streaming could cost {price.500} or more in roaming fees. Here is an honest, numbers-first comparison of eSIM plans vs every roaming alternative.
The true cost of carrier roaming
Home carrier international data charges vary widely:
| Carrier type | Pay-as-you-go rate | Notes |
|---|---|---|
| US carrier (T-Mobile, AT&T, Verizon) roaming | ₩13–₩19,800 per MB | Varies by destination country |
| UK carrier (EE, Vodafone, O2) zone 1 | £0.002–£10 per MB | 'Zone 1' countries cheapest |
| Carrier international add-on package | ₩13,200–₩26,400/day or ₩66,000–₩132,000/week | Often throttled to 256 kbps |
| EU roaming (within EU/EEA) | Free at home rates | Genuine exception — no extra charge |
At ₩13,200/MB, a 1 GB video stream costs ₩13,200,000 Even 'day pass' add-ons at ₩13,200/day throttle to 256 kbps — barely enough for maps.
Real cost comparison by trip type
7 days in Europe (5 GB data)
| Option | Cost | Notes |
|---|---|---|
| Carrier roaming (pay-as-you-go) | ₩198,000–₩660,000 | Extreme bill shock risk |
| Carrier travel package (day pass) | ₩92,400–₩184,800 | ₩13,200/day × 7, often throttled |
| Local physical SIM in France | ₩19,800–₩33,000 | Covers France only, requires store visit |
| LTE.app Europe eSIM (30+ countries) | ₩15,840–₩26,400 | Full LTE speeds, instant activation |
14 days in Asia (10 GB data)
| Option | Cost | Notes |
|---|---|---|
| Carrier roaming | ₩396,000–₩1,320,000+ | Extreme risk |
| Carrier international package | ₩105,600–₩198,000 | Often insufficient data |
| Local SIM in Japan | ₩19,800–₩33,000 | Japan only, language barrier |
| LTE.app Asia regional eSIM | ₩19,800–₩46,200 | Covers Japan, Korea, Taiwan |
3 days in the US (2 GB data)
| Option | Cost | Notes |
|---|---|---|
| Carrier roaming day pass | ₩39,600–₩79,200 | ₩13,200–₩26,400/day |
| US prepaid local SIM (Mint, T-Mobile) | ₩19,800–₩26,400 | Physical store required |
| LTE.app US eSIM | ₩10,560–₩19,800 | Instant QR, full LTE |
Hidden roaming charges that multiply the cost
When roaming actually makes sense
LTE.app membership makes eSIM even cheaper
LTE.app Pro membership (₩13,187/mo) saves 7% on every eSIM plan. Premium (₩26,387/mo) saves 12%. For frequent travelers purchasing 3–4 plans per month, the membership pays for itself:
| Travel pattern | Monthly plan spend | Pro saves | Premium saves |
|---|---|---|---|
| 1 trip/month (1 plan) | ₩19,800 | ₩1,386 | ₩2,376 |
| 2 trips/month (3 plans) | ₩59,400 | ₩4,158 | ₩7,128 |
| 4 trips/month (6 plans) | ₩118,800 | ₩8,316 | ₩14,256 |
| Heavy traveler (10 plans) | ₩198,000 | ₩13,860 | ₩23,760 |
At 6+ plans per month, Pro pays for itself. At 10+ plans per month, Premium pays for itself.