16 of 16 AI responses use provider evidence originally observed Oct 20, 2026, 4:29 AM to Oct 20, 2026, 4:32 AM UTC under the 24-hour free-scorecard reuse window. This report and its customer-owned assessment were assembled separately for this scan.
SoSIM · Sources
Sources retained with the original answers. Follow each source or return to its answer context.
Complete reportSources
Sources retained with the original answers. Follow each source or return to its answer context.
prepaid-data-sim-card.fandom.com Roaming SIMs for China
Source ownership not retained
Answers using this source
Claude · 經常往返香港和深圳，希望同一個電話計劃方便兩地使用，有哪些品牌值得比較？ in Hong Kong?
Oct 20, 2026, 4:30 AM UTC
Since you cross often, the most useful option is a plan that includes Mainland China data on a Hong Kong number. A standard Hong Kong plan stops working at the Shenzhen border. A Hong Kong SIM or eSIM does not work once you cross into Shenzhen, and vice versa. Here are the main carriers to compare. Prices and terms come from third-party guides and carrier pages, so check the current offers before you sign up.
1. China Mobile Hong Kong (CMHK) This is the strongest fit for weekly Shenzhen trips. Its Greater Bay Area plans include free data roaming in Mainland China (5G) and Macau (4G) , and one guide says that CMHK almost always wins once you do the maths over a 12-month period. Compare its total monthly cost against a cheaper base plan plus roaming add-ons.
2. China Unicom Hong Kong (CUniq) This is a shared-pool option. One guide reports that China Unicom HK offers shared data plans starting from HK$398 per month for 30 GB of combined Hong Kong and mainland China data . The same source notes that these are contract plans (typically 24 months) , so check the commitment before you commit.
3. 3HK (Three) This is the value option. One source says its flagship $88 per month plan bundles 32GB of local data, an additional 2GB shared with Mainland China and Macau . That mainland allowance is much smaller than CMHK's, so it suits lighter cross-border use.
4. SmarTone Mainland roaming here is limited to higher tiers. One guide says a mid-tier $148 plan adds 5GB of Mainland and Macau roaming data . Choose it mainly if strong 5G coverage matters to you.
5. CSL (HKT group) CSL's 5G plans list Mainland China and Macau roaming, but the terms say the roaming package must be subscribed separately and that the customer has activated IDD, roaming service and subscribe to Data Roaming Day Pass service . Read the fine print before relying on it.
Other options to know about
- eSIM from a regional provider (for example Roami or Airalo): these can cover both places, but they're better for occasional trips than daily commuting. One guide notes that
a China-only eSIM plus a Hong Kong-only eSIM is almost always cheaper than a regional plan that covers all three .
- Prepaid SIMs: if you consider one, note that 7-Eleven says
from 17 June, 2026, all prepaid SIM cards do not support Activation in Chinese Mainland. Activation has to happen in Hong Kong.
How to choose
- If you cross most weeks, start with CMHK's Greater Bay Area plan and compare its price with 3HK plus add-ons.
- If you cross occasionally, 3HK or a regional eSIM may cost less.
- Check whether the mainland allowance is shared or separate, whether it is 4G or 5G, and whether the contract is 12 or 24 months.
- Confirm your phone supports dual SIM or eSIM, so you can keep a second line active.
Turn the evidence into your next move.
Inspect the exact answers first, then use the relevant GEO guidance or review the source-backed knowledge about this brand.