Plan-specific
eSIM for Czechia
An eSIM as a second line. Depending on the plan, it provides data or also a separate number, calls and SMS.
- Features listed per plan
- Your main number stays active
- Buy without creating an account
Less data collected. More peace of mind.
An eSIM as a second line, with features listed per plan. No long-term commitment — Stripe handles card payments and we do not keep card numbers.
Coverage·198+ destinations live
Interactive eSIM coverage map
Coverage
198+ destinations live
- Available
- Not supported yet
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View legal information
Policy version 2026-07-24 · effective 24 July 2026
The TvojeData app
Your whole eSIM in one app
Install your eSIM via QR, check the carrier's latest usage reading, top up in one tap and get alerts based on available readings. Free for iPhone and Android.
QR install
Install your eSIM from the app via QR — no code juggling.
Usage overview
See the carrier's latest timestamped reading. Usage can lag by several hours.
One-tap top-up
Out of data? Top up right in the app — no reinstall.
Smart alerts
We ping you before your data or validity runs out.
At a glance
- No registration for standard checkout
- Standard checkout needs only email and payment
- Name, phone, and billing address are optional; date of birth, a mandatory residential address, national identifier, and ID are not collected
- We do not create a data profile to sell to third parties
- Byte does not store full card or wallet details; Stripe processes payment and retains the Flex payment method for the next 30-day prepaid period
- We do not pass personal data on as a standalone product
- Non-essential traffic and conversions are measured only after analytics consent; advertising measurement runs only after marketing consent
- Automatic eSIM quality tests are off by default; they run only when you explicitly enable them or start a manual test. One test is small, usually up to 1 MB.
eSIM service
An eSIM separate from your main number
A standard purchase without creating an account. Pick one-off data, Flex without commitment, or data for trips.
No commitment
Flex – renewing 30-day prepaid service
Each next 30-day data bundle is paid in advance, and renewal can be switched off at any time. No long-term commitment or debt.
- 30-day renewal only after successful payment
- No payment means no new bundle and no debt
- Switch renewal off anytime in management
For trips
Data for trips
A travel eSIM instead of roaming. Exact data, voice and SMS features are listed for each plan.
- Coverage across countries
- QR by email after payment
- Your number stays as a second line
Overview
What we need from you — and what we don't
What we need
We keep the data set practical and limited so we can complete and later support the order.
- email for QR delivery, receipt/invoice and order support
- order details: selected package, price, currency, payment status and eSIM delivery status
- technical and security records required to run the site, prevent abuse and resolve errors
- diagnostic results after eSIM activation: reachability, speed estimate, latency, network status and provider usage delta where available
What a standard purchase does not require
We do not turn checkout into mobile-network registration or a loyalty profile. A field stays out unless it is needed for the order, payment, delivery, or required records.
- we do not require account registration for a standard purchase
- we do not create a data profile to sell to third parties
- we do not store full payment-card or wallet details; Stripe processes payment and, for Flex, securely retains the payment method for the next 30-day prepaid period
- name, contact phone, and billing address are optional for personalization, details on a payment document or invoice under the applicable tax regime, or a saved profile and are not required or verified as mandatory subscriber-identification data; we do not collect date of birth, a mandatory residential address, a national identifier, a document number, or a document photo; any wholesale supplier KYC flag is disclosed, not used as a checkout gate, and we attempt fulfilment without identity verification; if the upstream rejects that activation after payment, the service is not supplied and we do not request an identity document; Byte promptly initiates the refund and its accounting reconciliation, and if the automatic refund does not complete for technical reasons, Byte completes it manually without asking for an identity document
- we do not store the content of mobile-network communication, calls, SMS or app data
- public speed summaries do not contain profile, order, ICCID, QR code or precise location
Who processes data
Specialized services are used only where they have a clear role. Non-essential analytics run only after analytics consent, and advertising measurement only after marketing consent.
- Stripe processes payment and payment confirmation and securely retains the Flex payment method for the next 30-day period
- eSIM Access and MobiMatter act as wholesale technical suppliers that create and operate the eSIM profile for the order
- the email provider delivers the QR code, confirmations and support replies
- GA4, PostHog including session replay, and Umami load only after analytics consent
- advertising tools and server-side advertising conversions (Meta, Google Ads, Seznam/Sklik, TikTok, Microsoft Ads, Reddit) run only after marketing consent
- the mobile network processes operational data needed for connectivity, roaming and network security
Retention and accounting
We do not promise deletion before legal, accounting or security reasons have ended. At the same time, we do not keep checkout data just because it might be useful one day.
- contract and order data for no more than 3 years after the end; accounting and tax documents for 10 years
- ordinary operational, security, and diagnostic logs for no more than 90 days; a specific incident or complaint may be evidenced during handling and for no more than 3 years afterwards
- non-essential analytics only with consent: GA4/Firebase for no more than 14 months and PostHog/Umami for no more than 12 months
Service roles
Byte development s.r.o. concludes the contract through TvojeData, provides the prepaid service, accepts payment, and handles support and complaints. Specialized services handle payment, email delivery, wholesale eSIM provisioning and, after consent, analytics. The mobile network provides the actual connectivity.
TvojeData
- Why we use it
- providing the prepaid service, order handling, and customer support
- What it typically sees
- email, order, invoice details and operational records required for ordering and support
Stripe
- Why we use it
- secure payment processing and, for Flex, retaining the payment method for the next 30-day period
- What it typically sees
- payment metadata, payment status, Stripe customer/payment-method identifiers, and details needed to confirm the transaction
Technical eSIM supplier
- Why we use it
- wholesale eSIM profile creation and technical operation
- What it typically sees
- technical eSIM details, QR/activation data and profile status
Email provider
- Why we use it
- QR delivery and support replies
- What it typically sees
- email address and transactional or support email content
Analytics
- Why we use it
- measuring site and checkout performance after analytics consent
- What it typically sees
- product events, technical measurement data and, for PostHog, session replay according to project settings
Ad measurement
- Why we use it
- purchase attribution, remarketing, and advertising conversions after marketing consent (Meta, Google Ads, Seznam/Sklik, TikTok, Microsoft Ads, Reddit)
- What it typically sees
- ad events, server-side conversions and, on purchase, hashed email plus IP address; we do not send the optional phone number to ad networks
Mobile network
- Why we use it
- connectivity and roaming
- What it typically sees
- operational network data needed for connectivity; TvojeData does not store communication content
Automatic diagnostics
- Why we use it
- checking connection quality after activation and publishing aggregate speeds
- What it typically sees
- test result, speed estimate, latency, app version, related profile/order reference and provider usage delta; public reporting is aggregate only with at least 10 samples and 10 privacy units
Cookies and session replay
Essential cookies keep the site functional and secure. Umami, GA4, and PostHog including session replay load only after analytics consent; advertising measurement loads only after marketing consent. The cookie banner stores your choice and lets you change it.
- td_session is used for login if you use an account; a standard eSIM purchase does not require registration
- csrf_token protects forms and checkout from abuse
- cookie_consent stores your choice — your analytics and ad-personalization preference
- td_attribution is a non-essential first-party marketing cookie. It stores and uses referral, affiliate, or white-label tenant identifiers and ad-click identifiers (e.g. gclid, sznaiid, UTM) for purchase attribution only after marketing consent; without that consent it is neither stored nor used
- Accounting records and settlement of a commission already earned from a completed order may be handled separately without a client-side tracker; this does not make td_attribution an essential cookie
- Umami, GA4, and PostHog session replay load only after analytics consent; you can change the choice at any time in cookie settings
- PostHog session replay may capture site and checkout interactions; payment details are processed by Stripe outside our replay
- Analytics consent is not marketing consent. Advertising pixels and server-side advertising conversions for Meta, Google Ads, Seznam/Sklik, TikTok, Microsoft Ads or Reddit run only after marketing consent. Where consent is given they may process hashed email and IP address; we do not send the optional phone number, passwords, or eSIM content to ad networks.
Provider and technical network
Byte development s.r.o. is the provider of the prepaid electronic-communications service, seller, and merchant of record: it accepts the order and payment, delivers the QR, and handles support and complaints. eSIM Access, MobiMatter, and visited mobile networks are wholesale technical suppliers, not the customer's contracting party. A standard purchase can be completed with email only; name, phone, and billing address are optional for personalization, tax-document details, or a profile, and we do not collect date of birth, a mandatory residential address, a national identifier, or ID.
FAQ
Short answers about privacy
Do I have to register to buy an eSIM?
No. You can complete a standard purchase without an account using only email for QR delivery and support. Name, phone, and billing address are optional for personalization, an invoice, or a profile; they are not a condition of service.
Do you store my payment details?
Byte does not store full card or wallet details. Stripe processes payment and securely retains the Flex payment method for the next 30-day prepaid period; you can switch renewal off at any time.
Is buying an eSIM anonymous?
Not in the sense of anonymous internet: the mobile network still processes operational connectivity data. Standard TvojeData checkout can be completed with email only. Optional name, phone, and billing address are for personalization, details on a payment document or invoice under the applicable tax regime, or a profile; we do not require or verify them as mandatory subscriber-identification data, and leaving them blank does not block the service. We do not collect date of birth, a mandatory residential address, a national identifier, a document number, or ID upload. Any wholesale supplier KYC flag is disclosed, not used as a checkout gate, and we attempt fulfilment without identity verification. If the upstream rejects that activation after payment, the service is not supplied and we do not request an identity document. Byte promptly initiates the refund and its accounting reconciliation; if the automatic refund does not complete for technical reasons, Byte completes it manually without asking for an identity document.
Will I lose my number?
No. Your existing SIM remains active. Depending on the selected plan, the new eSIM is data-only or may include a separate foreign number and calls/SMS; the parameters shown for the selected plan control.
Why does the app measure connection quality?
After activation, automatic tests are off by default. They run only when you explicitly enable them or start a manual test; one test usually uses up to 1 MB to separate device, location and provider issues. Public speed numbers are aggregate only, require at least 10 confirmed samples and do not include profile, order, ICCID, QR code or precise location.
Legal note
This page explains the product approach to data. It does not replace the full privacy policy or legal advice.