eSIM Card
ByteSIM
eSIM Card vs ByteSIM: Which eSIM Should You Buy?
Updated September 30, 2026
The Short Answer
Pick eSIM Card if you know your exact data need and trip length and want a plan sized to match, with a phone number as an optional bought add-on. Pick ByteSIM if you actually need a real local number, with calls and texts bundled into the plan itself, in one of its supported countries, and you're fine handing over ID verification to get it.
The Core Difference: Priced-by-the-Day Sizing or a Bundled Local Number
eSIM Card's whole pitch is granularity. Its United States page alone lists roughly 30 combinations: seven fixed-data tiers from 1GB to 100GB, each sold at several validity windows from 3 to 90 days, plus two separate unlimited tiers running 1 to 30 days. If you know precisely how much data and how many days you need, there's a plan sized for that instead of rounding up to whatever bundle a competitor offers.
ByteSIM takes a different approach: most of its plans are data-only like everyone else's, but in select countries (the US, Canada, UK, France, Spain, Australia, Vietnam, South Korea, and Thailand) it sells plans that bundle a real local phone number, with calls, texts, hotspot sharing, and a local IP address, alongside the data. eSIM Card also offers a number, but as a separate paid add-on starting around $2.40, purchased apart from the data plan rather than built into one.
Feature Snapshot
| Feature | eSIM Card | ByteSIM |
|---|---|---|
| Plan sizing | ~30 combinations per country (7 GB tiers × multiple validity windows, plus 2 unlimited tiers) | Standard fixed-GB and unlimited plans; number-bundled plans in select countries |
| Phone number | Separate virtual number add-on, from ~$2.40 | Real local number bundled into select-country plans, with calls/texts included |
| ID verification | Not mentioned for standard data plans | Required for number plans (passport photo + selfie), per local telecom regulation |
| Refunds | Non-refundable once installed/used, narrow exceptions within 30 days | Not detailed on-site beyond standard eSIM caveats |
Details drawn from each provider's own site and, for ByteSIM, our own purchase. Plan availability and exact pricing vary by destination and change over time.
Discount Codes
- eSIM Card: ESIM10, 10% off esim. Full code list →
- ByteSIM: TPDBYTE, ~5% off (advertised as 10%). Full code list →
Neither code is one of ours; both are public codes found on each provider's own site. eSIM Card's is advertised as 10% off and matched what we found on its homepage. ByteSIM's is advertised elsewhere as 10% off too, but we tested it on a real order and it only knocked about 5% off, roughly the same as ByteSIM's automatic Summer Sale that applies with no code at all.
Is eSIM Card or ByteSIM the Right Pick
Go with eSIM Card if…
- You know your exact data need and trip length and want a plan sized to match
- You want the option to add a number or a voice-enabled eSIM later, from the same app
- You're confident about the plan before buying, since there's little room to change your mind after
Go with ByteSIM if…
- You need a real local number, with calls and texts, not just data
- Your destination is one of ByteSIM's supported local-number countries
- You'd rather have a human on WhatsApp if something goes wrong during activation
Two Things Worth Knowing Before You Decide
eSIM Card doesn't publish the exact fair-use speed cap on its unlimited plans. Its own wording only promises "an allowed limit of data at full speed per 24 hours" without naming the GB figure. If you want a provider that states that number outright, see Saily, which publishes 5GB in a rolling 24 hours in most destinations.
ByteSIM's advertised discount doesn't match what it actually saves. We bought a real plan and TPDBYTE landed around 5% off, not the 10% it's advertised as elsewhere. If a bundled phone number isn't a must-have and you'd rather have a free one instead of a paid add-on or a discount that undersells itself, see AloSIM, which bundles a free Hushed virtual number with its plans.
For device setup and eSIM basics that apply to both providers, see our eSIM compatible devices guide.
eSIM Card vs ByteSIM FAQ
Which is cheaper, eSIM Card or ByteSIM
It depends on what you're buying. For plain data, eSIM Card's granular sizing lets you avoid overpaying for data you won't use. If you need a real local number, ByteSIM's bundled number-and-calls plans avoid paying for a separate number add-on on top of data.
Do both give you a phone number
Both can, but differently. eSIM Card sells a virtual number as a separate paid add-on starting around $2.40. ByteSIM bundles a real local number, with calls, texts, and hotspot sharing, directly into plans in select countries, but requires ID verification to get one.
Are the discount codes worth using
eSIM Card's ESIM10 matched its advertised 10% off on its own site. ByteSIM's TPDBYTE is advertised as 10% off elsewhere, but tested on a real order it only saved about 5%, similar to ByteSIM's automatic Summer Sale that needs no code.
Which is better for someone who just wants data with no phone number hassle
eSIM Card, if you don't want ID verification at all: its standard data plans don't require it. If you also want a free virtual number bundled in rather than a paid add-on, see AloSIM instead.
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