Check your last three carrier bills before shopping. If your busiest month used 12GB, a 100GB allowance is mostly unused capacity. If you regularly tether a laptop, the opposite applies: a cheap plan that slows sharply after its allowance can be a poor fit.
A useful starting shortlist
| Plan and source | Payment and allowance | Who it suits |
|---|---|---|
| Club SIM | HK$58 / one month; 20GB, up to 42Mbps, unlimited local voice | Everyday use without a fixed-term contract; budget for renewing the pack |
| SoSIM renewal pack | HK$48 / 30 days; 60GB fair-use allowance, 5,000 local minutes | More data for less cash; the starter offer is a different product |
| 3HK 5G | 30GB: HK$124 base monthly fee; check the term and HK$28 administration fee | People who want 5G and accept a commitment; the HK$107 average is a conditional 36-month port-in offer |
These are starting points, not a claim that one network works best everywhere. Try a prepaid SIM on your commute and inside your home before moving your main number to a long contract. Test at the time you normally use it, including your laptop if hotspot access matters.
Compare a whole year, not one advertised month
Twelve HK$58 one-month packs cost HK$696. Twelve HK$48 30-day packs cost HK$576 but cover only 360 days; if you need uninterrupted service for 365 days and can only renew whole packs, you buy a thirteenth, bringing cash paid to HK$624 with days left over. Neither calculation includes an optional roaming pack or a different initial port-in purchase.
For a contract, add compulsory fees over the full commitment and subtract only rebates you qualify for. A hypothetical HK$128 plan plus HK$18 administration costs HK$3,504 over 24 months. A HK$500 shopping voucher is worth HK$500 only if you would have spent that amount at that shop anyway.
When a different plan makes more sense
- Keeping a number overseas: compare SIM validity and overseas SMS support. Monthly local data is often the wrong expense.
- Frequent Mainland visits: price the Mainland allowance you actually need, not a large Hong Kong allowance plus a tiny roaming bonus.
- A smartwatch or several family lines: check that the exact plan supports the add-on, then include every extra line fee.