Research FAQ

An eSIM is a digital SIM permanently integrated into your device. It stores carrier profiles digitally, allowing remote activation without a physical card. The GSMA SGP.22 specification defines the technical standards for consumer eSIM provisioning.

The GSMA SGP.22 specification defines the architecture, interfaces, and security requirements for consumer eSIM Remote SIM Provisioning. It covers the SM-DP+ server, Local Profile Assistant (LPA), and eUICC hardware.

EU "Roam Like at Home" regulations require EU carriers to allow customers to use their domestic plan across EU member states at no extra charge, subject to fair use policies. Non-EU travelers are not covered.

Non-Standalone 5G (NSA) uses 4G infrastructure for control functions. Standalone 5G (SA) operates entirely on 5G infrastructure. Most European deployments are NSA. SA enables the full range of 5G capabilities.

A Mobile Virtual Network Operator provides mobile services without owning network infrastructure, purchasing wholesale capacity from MNOs. Many travel eSIM providers are MVNOs or resellers of MVNO capacity.

Network steering directs devices to preferred network partners. Poor steering can result in connecting to lower-quality networks even when better options are available. This is a significant differentiator between providers.

Key bands: Band 20 (800 MHz, rural 4G), Band 3 (1800 MHz), Band 7 (2600 MHz). For 5G, Band n78 (3.5 GHz) is the primary mid-band. Verify band support for your device and destination countries.

Light use: 500MB-1GB/day. Moderate: 2-3GB/day. Heavy (video calls, streaming): 5-10GB/day. Remote workers: 5-15GB/day. Plan based on your specific usage profile and trip duration.

IPX (IP Packet Exchange) is the interconnection framework for international mobile roaming. Traditional roaming routes data through IPX networks back to your home carrier, adding latency. Local eSIM plans avoid this routing.

iPhone: Settings → General → About → look for EID. Android: Settings → Network & Internet → SIM cards → look for "Add SIM". Check for carrier lock status — locked devices may have eSIM restricted.

The embedded Universal Integrated Circuit Card is the secure hardware element that stores eSIM profiles. It contains a secure operating system and cryptographic capabilities. Capacity varies by device.

Speed reduction after the high-speed data allowance is exhausted. Typically to 128-512 Kbps. Email and messaging remain functional; video calls and streaming become impractical.

Technically possible but controlled by provider policy. Many providers allow transfer when upgrading devices. Some restrict transfers for security or commercial reasons. Check provider policy before assuming transfer is possible.

GSMA SGP.22 mandates end-to-end encryption for profile delivery. Reputable providers using GSMA-certified infrastructure provide strong security. Application-layer encryption (VPN) is advisable for sensitive communications regardless of connectivity method.

Western EU countries offer the most consistent high-quality coverage. Central Europe has improved substantially. The Balkans and Eastern Europe have more variable coverage, particularly in rural areas. Always research specific destinations.

Limits roaming benefits to prevent permanent roaming. Carriers may limit data or charge extra if roaming usage significantly exceeds domestic usage. Long-term travelers should check their carrier's specific policy.

Norway and Iceland: yes (EEA members). Switzerland: no (not EU/EEA), though many carriers have bilateral agreements. UK: no longer covered since Brexit.

The GSMA-certified platform that creates and manages encrypted eSIM profiles. When you purchase an eSIM plan, the SM-DP+ server prepares an encrypted profile downloaded to your device's eUICC.

Toggle airplane mode, verify correct eSIM is active, try manual network selection, restart device. Contact provider support with EID and ICCID numbers. Ensure you're in a covered area per the provider's coverage map.

Local prepaid SIM cards, portable Wi-Fi devices, hotel/café Wi-Fi, or home carrier international roaming add-ons. Local SIM cards offer best value for extended single-country stays.

Enable data monitoring in device settings. Set alerts at 80% of allowance. Use Wi-Fi for large downloads. Disable background app refresh. Download maps and content offline before leaving Wi-Fi.

Verify eSIM support and carrier-unlock status. Purchase and install plan 24-48 hours before departure. Verify profile in cellular settings. Note provider support contact. Download offline maps as backup.

Most plans support hotspot tethering. Check plan terms. Using hotspot significantly increases battery drain. Carry a portable charger for extended tethering use.

Regional plans (Europe-focused) typically offer better pricing and coverage quality for European travel. Global plans are more useful for multi-continent travel. For Europe-only trips, regional plans are usually the better choice.

Our research combines field testing across European destinations, analysis of regulatory documentation and network operator filings, community feedback from traveler panels, and review of academic literature on mobile network performance. We disclose methodology and acknowledge limitations in all research publications.