When you should NOT buy an eSIM
This page earns us nothing. That's the point. RoamReady makes money when you buy an eSIM through our links — and a site with that incentive that never says "don't buy" is just a shop with extra steps. So here are the six situations where the honest answer is: skip the eSIM.
The fast answer
Don't buy an eSIM if: (1) your phone isn't eSIM-capable or is carrier-locked, (2) you're an EU/EEA customer traveling inside the EU (roam like at home is free), (3) your trip is very short and Wi-Fi-first, (4) your home carrier's included roaming already covers the trip, (5) you specifically need a local phone number (a data-only eSIM is the wrong product), or (6) you're staying somewhere for months — local plans win on price. Every case below explains the test.
1. Your phone isn't eSIM-ready — or it's carrier-locked
Everything else is irrelevant if the hardware says no. iPhones need XS/XR or newer (and in China mainland, per Apple, only the newest models support eSIM); Pixels need 3a or newer; other Androids vary by model (exact Settings paths here). Separately, a carrier-locked phone will refuse foreign eSIM profiles — Sim Local's activation guide makes "ensure your iPhone is carrier-unlocked" its first precondition (source). Locked phones can usually be unlocked for free by the carrier, but not instantly and not from the departure gate.
2. You're an EU/EEA customer traveling inside the EU
The EU's "roam like at home" rule gives you calls, texts, and data at domestic prices across EU/EEA countries, with incoming calls and texts free — official reference at europa.eu. Unless your plan hits the fair-use data cap (possible with very cheap per-GB plans), buying an eSIM to travel from Germany to France is paying twice for the same thing. UK travelers: this rule no longer covers you — check our Europe guide.
3. Very short trips on Wi-Fi-first itineraries
A 2-day city break with hotel Wi-Fi, offline maps downloaded at home, and dinner reservations already made can honestly run on zero cellular data. The test: name three things you'll need mobile data for while walking around. If you can't, pocket the money. (If you can — navigation, translation, ride apps — a small 1 GB pack is a few dollars; see any of our destination guides.)
4. Your home plan's roaming already covers it
Many premium home plans include roaming allowances (common in EU, UK, and Asian premium tiers), and paid daily roaming passes sometimes undercut eSIM day passes. Do the four-step test: (1) your plan's included-roaming countries, (2) the daily data cap on the roaming pass, (3) whether tethering is included, (4) total cost for your trip days — then compare against a correctly-sized eSIM. Buy whichever wins; there's no ideology here, only arithmetic.
5. You need a local number, not data
Data-only travel eSIMs cannot give you a local phone number. If your trip depends on receiving local calls or SMS verification (some banks, government services, apartment intercoms in some countries), you need a voice product — carrier-marketplace plans with calls (Sim Local's category) or local voice eSIMs like Mobal's Japan voice eSIMs with a real Japanese number. Note the flip side that makes plain eSIMs work for most people: on a dual-SIM phone your home number keeps receiving SMS while the eSIM carries data. Our Japan guide covers this in detail.
6. Long stays — months, not weeks
Travel eSIMs price for convenience, not volume. Past a month or two in one country, a local carrier plan (physical SIM or local-carrier eSIM) almost always wins on cost — and often includes voice. This is the rare case where we point you away from every product that pays us: sign up with a local operator.
The eSIM industry's least-mentioned fact
"Unlimited" plans throttle. Airalo's Japan unlimited product drops to 1 Mbps after 3 GB/day (their own page's wording); Holafly caps hotspot sharing at 1 GB/day; Sim Local sells Korean "unlimited" as explicit 5–10 GB/day tiers (sources in the buying guide). None of this makes the products bad — it makes the marketing incomplete. If you buy, buy knowing the real number.
Read this before the comment section tells you otherwise
None of these six cases means eSIMs are a scam. For the median 1–4 week trip on an unlocked modern phone, a correctly-sized eSIM is the cheapest combination of convenience and price we know — that's why the rest of this site exists. The honest position is both: eSIMs usually win, and there are six well-defined cases where they don't.
Read all six and still need an eSIM?
Then you're exactly who these products are for — start with the buying framework, and if a provider fits, these links support the site: