You may not need to buy anything. Open your current mobile plan and check whether the destination is included, how much roaming data remains and what happens when it runs out. If that covers the trip, buying a separate eSIM adds another activation and expiry date to manage.
Eliminate plans that cannot do the job
- Check the exact phone model and where it was sold. Apple notes that some Hong Kong and Macao models use two physical SIMs; a familiar model name alone does not establish eSIM support. The phone must also accept another carrier.
- List every destination, including an overnight stop. A China-only pack need not cover Hong Kong or Macau.
- Check whether you need ordinary calls, a local number or bank SMS. A data-only pack supplies internet, not those services.
- For laptop use, find the hotspot allowance. Unlimited phone data can come with a smaller tethering limit.
Three providers: the terms that change the decision
| Provider | Useful distinction | Before paying |
|---|---|---|
| Airalo | Package validity can start on installation or first supported-network connection. The listed GB is normally a total pool. | Read the specific package, not a general installation tip. Check top-up availability. |
| Holafly | Its China product advertises unlimited phone data but 1GB/day of sharing. That distinction matters for work. | Check the destination-specific hotspot and fair-use terms; do not apply China’s allowance to every country. |
| Nomad | Its China page lists fixed-data and unlimited options and a 60-day purchase-to-activation deadline. | Do not buy months ahead without checking automatic activation and the selected plan’s instructions. |
Compare the bill for your trip
Suppose a ten-day trip needs 6GB. A hypothetical HK$50/3GB pack is not cheaper than a HK$80/10GB pack if you must buy the smaller one twice: HK$100 versus HK$80. Conversely, a HK$120 unlimited pack may add no value if 6GB is enough. Use your previous trip’s phone data counter as a starting point, then add any laptop use.
Compare in one currency after card fees, for the same usable days. Check whether a “day” means 24 hours or a calendar day, and whether a top-up preserves leftover data or starts a new pack. Keep the order and support details available offline.