There are some edge cases where a service won't be available while roaming. Guidance from eSIMDB notes that if your eSIM is sourced back to a carrier in Hong Kong, that means you'll be using a Hong Kong IP address. You'll see search results localized by Google Hong Kong, and websites that aren't accessible in Hong Kong will also not be accessible to you. OpenAI, for example, has not made ChatGPT available in either Hong Kong or China, so you won't be able to use that service while on your trip. You are able to use Google Gemini, though, as it launched in the territory as of March 2026.