Intelligence FAQ

An eSIM (embedded SIM) is a programmable SIM permanently integrated into a device's circuit board. Unlike a physical SIM that stores a single carrier profile on a removable chip, an eSIM can store and manage multiple operator profiles digitally. For travelers, this enables remote activation of data plans before departure and seamless switching between providers.

The GSMA (Global System for Mobile Communications Association) is the industry body that defines eSIM technical standards. GSMA certification of SM-DP+ servers ensures that providers meet security and interoperability requirements. Travelers should prefer providers using GSMA-certified infrastructure.

EU "Roam Like at Home" regulations require carriers based in EU member states to allow customers to use their domestic plan across the EU at no extra charge, subject to fair use policies. These regulations do not apply to travelers from outside the EU or to travel in non-EU European countries (except Norway, Iceland, and Liechtenstein as EEA members).

Fair use policies allow carriers to limit roaming benefits for customers who spend more time roaming than at home, to prevent "permanent roaming." Carriers may limit roaming data or apply surcharges if roaming usage significantly exceeds domestic usage. Long-term travelers should check their carrier's specific fair use policy.

ConnectIndex distinguishes between nominal coverage (provider maps) and realized coverage (actual traveler experience). Provider maps systematically overstate coverage, particularly in rural areas. Our analysis incorporates field testing data, regulatory coverage reports, and community feedback to provide more accurate coverage assessments.

Non-Standalone 5G (NSA) uses existing 4G infrastructure for control functions while adding 5G for data capacity. Standalone 5G (SA) operates entirely on 5G infrastructure. Most European 5G deployments are NSA. SA offers the full range of 5G capabilities but is less widely deployed. For most travelers, the distinction has limited practical impact.

Business travelers should prioritize reliability and support quality over cost optimization. The cost of a connectivity failure during a client meeting or important call far exceeds any savings from a less expensive plan. Premium eSIM plans with guaranteed network partnerships and responsive customer support are typically appropriate for business use.

Mobile Network Operators (MNOs) own and operate physical network infrastructure. Most eSIM travel providers are not MNOs — they are technology companies or MVNOs that purchase wholesale data capacity from MNOs and resell it through their own platforms. Coverage quality depends on the underlying MNO partnerships.

Network steering refers to how an eSIM provider configures preferred network connections in destinations with multiple available networks. Poor steering configuration can result in connecting to a lower-quality network even when better options are available. This is a significant differentiator between providers that is not visible from marketing materials.

The GSMA SGP.22 specification mandates end-to-end encryption for eSIM profile delivery. Reputable providers using GSMA-certified infrastructure provide strong security for the provisioning process. For sensitive communications, application-layer encryption (VPN, end-to-end encrypted messaging) is advisable regardless of connectivity method.

Virtually all plans marketed as unlimited apply speed throttling after a high-speed data threshold. Evaluate the effective cost per GB of high-speed data rather than the nominal plan price. For travelers with high data requirements, the throttling threshold is more important than the nominal "unlimited" designation.

For multi-country itineraries, an eSIM aggregator plan with broad European coverage provides the most convenient solution. For travelers spending extended time in specific countries, supplementing with local SIM cards for those stays typically provides better value. Maintain a backup connectivity option for critical connectivity needs.

Western EU countries generally offer excellent coverage. Norway, Iceland, and Switzerland have comparable quality. The Western Balkans have improved significantly but have more rural gaps. Coverage quality and eSIM provider support vary more widely in non-EU countries. Research specific destinations before traveling.

Key European LTE bands include Band 20 (800 MHz, critical for rural coverage), Band 3 (1800 MHz), and Band 7 (2600 MHz). For 5G, Band n78 (3.5 GHz) is the primary mid-band. Travelers with older devices should verify band support for their specific destinations.

Reputable providers typically disclose their GSMA certification status in their technical documentation or terms of service. You can also look for GSMA membership and SGP.22 compliance statements. Providers that are vague about their infrastructure should be evaluated more carefully.

IPX (IP Packet Exchange) is the interconnection framework for international mobile roaming. Traditional roaming routes data through IPX networks back to your home carrier before reaching the internet, adding latency. Local eSIM plans avoid this routing, which is one reason they often provide better performance than traditional roaming.

Since Brexit, EU roaming regulations no longer apply to UK travelers visiting the EU or EU travelers visiting the UK. Some carriers have voluntarily maintained roaming benefits, but others have reintroduced roaming charges. UK travelers should check their carrier's current policy for EU travel.

ConnectIndex maintains strict editorial independence through a policy of not accepting payment from providers for editorial coverage, separating editorial and commercial functions, and disclosing any potential conflicts of interest. Our research is funded through clearly identified display advertising with no editorial influence.

The eUICC (embedded Universal Integrated Circuit Card) is the secure hardware element that stores eSIM profiles. It contains a secure operating system and cryptographic capabilities that protect stored profiles. The eUICC capacity determines how many profiles a device can store simultaneously.

eSIM profile transfer is technically possible but controlled by provider policy. Many providers allow transfer when upgrading devices, but some restrict transfers for security or commercial reasons. Always check provider policy before assuming transfer is possible.

Local prepaid SIM cards, portable Wi-Fi devices, hotel and café Wi-Fi, and home carrier international roaming add-ons are all viable alternatives. Local SIM cards typically offer the best value for extended stays in a single country.

Toggle airplane mode, verify the correct eSIM is set as data SIM, try manual network selection, restart the device. Contact provider support with EID and ICCID numbers if issues persist. Ensure you're in a covered area according to the provider's coverage map.

The SM-DP+ (Subscription Manager Data Preparation Plus) server is the GSMA-certified platform that creates, stores, and manages encrypted eSIM profiles. When you purchase an eSIM plan, the SM-DP+ server prepares an encrypted profile that is downloaded to your device's eUICC.

Light users (maps, messaging): 500MB–1GB/day. Moderate users (social media, browsing): 2–3GB/day. Heavy users (video calls, streaming): 5–10GB/day. Remote workers with video conferencing: 5–15GB/day. Plan accordingly for your trip duration and usage profile.

Purchase and install your eSIM plan 24–48 hours before departure. This allows time to troubleshoot any activation issues before you're in transit. Most plans don't start consuming your data allowance until you arrive in the destination country and connect to the local network.