Hong Kong: eSIM, roaming or a local SIM?
Narrow the choice by trip length, phone compatibility and whether your usual number must remain available.
GUIDES
Cross-border guides
Original guides for travel across borders: each one solves a specific problem and states its dates and sources.
CROSS-BORDER GUIDES
Short guides that start from a real problem
Articles are updated as needed; information about prices, policies and standards states its review date.
How much mobile data will your trip need?
Trip length is only the starting point. Video quality, autoplay and tethering usually change the result most.
Check these before travelling with an eSIM.
Do not wait until arrival to discover an incompatible phone, expired QR code or incorrect data line.
How big can a carry-on be before it is turned away?
Limits vary by airline, cabin and fare. Measuring and checking before departure beats fixing it at the gate.
Adapter or converter—which one do you actually need?
Read the power label on the device first, then decide between a plug adapter and a voltage converter. Getting it backwards can damage your gear.
No signal, no data—can maps still work?
Offline maps rely on GPS, not on the network. The key is to download, update and prepare supporting information before you leave.