Provider comparison

Birdie vs SoSIM

SmarTone's online-only Birdie versus 3HK's supermarket SoSIM. Birdie is a no-contract monthly service with owl-hours unlimited data and P2P sharing; SoSIM is a grab-and-go prepaid card whose superpower is converting into an Asia travel pack within 48 hours of activation.

Kelvin Wong·Editorially reviewed August 2026·Live price tables below

At a glance (live)	Birdie	SoSIM
Published plans	3	1
Cheapest monthly price	HK$98	HK$48
Largest data allowance	60 GB	50 GB

Two very different buying experiences

Birdie (自由鳥) is SmarTone's digital-first flanker: everything happens in the app — signup needs no address proof or shop visit, eSIM is free, and plans are no-contract monthly. SoSIM is 3HK's prepaid brand co-launched with ParknShop/Watsons and sold at their tills: you hand over ~$33 and walk out with a starter card packing 50GB for 30 days plus thousands of minutes.

Data policies & speed caps

Birdie's ladder runs $38/600MB entry, then popular tiers at $98/16GB (capped at 2Mbps), $128/30GB (full speed) and $148/60GB (full speed, then 21Mbps) — with unlimited data during 1am–6am "owl hours" and P2P data gifting between users. SoSIM keeps it simpler: one big bucket per 30-day cycle, historically with several price rises, plus a year-round GBA data pack around $138 for regular northbound travellers.

Travel conversion & small print

SoSIM's party trick: within 48 hours of activating a local card you can convert unused validity into a 5-day Asia-Pacific travel pack — genuinely useful for impromptu trips. Birdie counters with bundled CN/Macau travel days on many tiers, but note its roaming voice requires a $500 deposit or autopay, whereas voicemail and eSIM come free.

Birdie

Choose Birdie for ongoing monthly use: higher full-speed tiers, night-time unlimited data, P2P sharing and zero paperwork.

SoSIM

Choose SoSIM for minimum-commitment prepaid: cheapest possible entry, supermarket ubiquity, and the 48-hour Asia-pack conversion trick.

Birdie

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Birdie Monthly 16GB

HK$98/ mo

Local data: 16 GB
Network: 5G
Contract: Monthly
eSIM: Yes

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Birdie Monthly 30GB

HK$128/ mo

Local data: 30 GB
Network: 5G
Contract: Monthly
eSIM: Yes

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Birdie Monthly 60GB

HK$148/ mo

Local data: 60 GB
Network: 5G
Contract: Monthly
eSIM: Yes

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SoSIM

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SoSIM Prepaid 50GB

HK$48/ mo

Local data: 50 GB
Network: 5G
Contract: Prepaid
eSIM: Yes

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FAQs

Is Birdie really contract-free?

Yes — monthly rolling, cancel anytime in-app. Prepaying several months lowers the effective monthly price, but there's no termination penalty either way.

Which is better as a pure travel backup SIM?

SoSIM — the 48-hour APAC-pack conversion makes a single $33 card double as a short-haul travel SIM. If your trips are mainly northbound, its year-round GBA pack also undercuts most one-off China add-ons.

Methodology

How this mobile-plan list is built

DealSifu ranks live Hong Kong mobile plans from public provider data, then keeps the source and review trail visible so you can sanity-check each deal.

Sources: Operator and MVNO websites, offer pages and published plan terms are the primary sources.
Ranking: Default sorting uses the current effective monthly price, then lets you filter by data, network, eSIM, contract and provider.
Caveat: Promotions and retention offers can change quickly, so always confirm the final price with the provider before switching.
Freshness: Changed rows are reviewed before publishing, and each plan card links back to the stored source where available.

Read the full methodology →

More comparisons

Editorial prices are typical published ranges that shift with promotions; plan cards show live database prices. Confirm with providers before signing up.