Cheap 5G is no longer a contradiction in Hong Kong. As of August 2026 you can get a real 5G SIM for around HK$48–58 a month, an unlimited 5G plan for HK$98, and even 5G on the HK$33 SoSIM card by paying for a daily speed pass. The trick is that every one of those prices hides a trade-off — a data cap, a speed cap, a 24-month contract, or a lower place in the network queue. This guide walks through what the low end actually looks like in 2026.
What the money actually buys
| Plan | Data | Price | Fine print |
|---|---|---|---|
| SoSIM prepaid (3HK) | 50GB @ up to 42Mbps | HK$33 / 30 days | Then 128kbps “unlimited”; 1,500 voice minutes |
| SoSIM 5G speed pass | — | HK$9.9 / day | Pay-per-day 5G on the $33 card; a pass ends at 23:59 of the day you activate it |
| Club SIM 5G no-contract (csl) | 8GB / 20GB | HK$58 / HK$128 per month | Monthly auto-renew, eSIM, no contract — the cheapest true-5G entry point |
| Club SIM 5G (24-month) | 20GB / 50GB | HK$128 / HK$158 + HK$18 admin | After the bucket: unlimited up to 1Mbps |
| CUniq 5G 本地數據無憂 (24-month) | 20GB / 100GB | HK$248 / HK$388 per month | MNP rebate up to HK$30/mo; admin fee waivable with autopay; after quota unlimited at 1Mbps (50GB) or 5Mbps (100GB+) |
| HKBN 5G unlimited | Unlimited | HK$98 / month (28-month) | Plus 4GB China/Macau data and 3,000 minutes; Birdie SIM-only tiers run 16GB HK$98 / 30GB HK$128 / 60GB HK$148 |
| Lucky SIM monthly (4.5G) | 10GB / 20GB | HK$38 / HK$68 per month | 4.5G only, then 128kbps; prepay 12 months. Not 5G — listed so you know the difference |
| More Mobile 5G prepaid | 30GB | ~HK$48 / 30 days | Sold at SIM shops/resellers; one of the cheapest big-bucket 5G prepaids |
Now read the fine print, because in Hong Kong “unlimited” almost always means “unlimited at a reduced speed after a data threshold” (the fair-usage policy, FUP). The numbers that matter at the budget end are 128kbps (fine for WhatsApp and light web, nothing else), 1Mbps and 5Mbps (music, low-quality video and browsing are all fine). Our unlimited data guide explains the FUP conventions in full, and the best mobile plans pillar plus MVNO vs operator cover the wider picture.
Trade-offs at the low end
- Speed caps, not data caps: Club SIM and CUniq 5G plans give you full 5G speed until the allowance is gone, then “unlimited” at 1–5Mbps — not a hard cut-off, but a very visible slowdown.
- Data caps that bite: 8GB on Club SIM’s HK$58 plan is cheap but small; SoSIM’s $33 card gives 50GB at 42Mbps before dropping to 128kbps.
- Contract and admin fees: the truly cheap Club SIM 5G tiers are no-contract, but its $128/$158 5G options and all CUniq 5G 本地數據無憂 plans need a 24-month commitment, and most levy an HK$18/month admin fee unless you pay by credit-card autopay.
- 4.5G masquerading as cheap: Lucky SIM’s famous $38–$68 monthly plans are 4.5G-only — genuinely cheap, but they will never show a 5G signal.
- Online-only support: MVNO and sub-brand customer service is mostly app/WhatsApp, with few or no walk-in shops.
Read the plan’s terms for the phrase “allocated with less network resources” — that is how budget tiers quietly deprioritise you when the network is busy. Your speed holds up off-peak, but at a packed MTR interchange you sit behind the host operator’s own customers.
Is it actually 5G? Bands and phones
- Hong Kong’s 5G runs on these NR bands per OFCA: n1 (1.9–2.2GHz), n28 (700MHz), n78 (3.3/3.5GHz) and n79 (4.9GHz). 5G services have been live since April 2020.
- n78 is the workhorse band every operator uses for capacity. Before buying a phone — especially an overseas or mainland-market model — check the spec sheet lists n78, ideally n79 too.
- Budget 5G SIMs genuinely hit high speeds on n78: an independent test of CMHK’s HK$48 5G card averaged 226Mbps across 50+ locations, peaking over 600Mbps at Lok Fu and Wong Tai Sin.
- A 4.5G/4G plan never shows a 5G indicator. On a 5G SIM, the status bar only shows “5G” when you are actually camped on the NR network — a quick way to verify what you’re paying for.
Registration, activation and porting
- Real-name registration is mandatory for every SIM. The Telecommunications (Registration of SIM Cards) Regulation has been in force since 1 September 2021, and since 1 March 2022 every prepaid SIM must be registered before it can be used. You register with your HKID (or passport) in the provider’s app or website.
- SoSIM: buy the HK$33 card at 500+ PARKnSHOP, Watsons or Hung Fook Tong outlets, the online shop or WeChat mini-program (eSIM available). Register the SIM in the SoSIM app, insert it and activate; top-ups are done in the app. Number port-in is online and usually completes in about 3 days.
- Club SIM: buy the SIM (7-Eleven, Circle K or online), create an account, then buy a monthly pack in the app or website. The 5G no-contract packs (8GB HK$58 / 20GB HK$128) auto-renew monthly.
- Lucky SIM: buy from an authorised reseller, then register at rnr.luckysim.com.hk — verification takes up to 2 business days and you get an SMS when the card is live. Remember it is 4.5G, not 5G.
- CUniq: contract plans (5G 本地數據無憂) are signed online or in-store for 24 months; the no-contract 月神卡 prepaid and eSIM data cards just need online real-name registration before activation.
Frequently asked questions
Is cheap 5G in Hong Kong actually slower than a big-operator plan?
Not always — two things decide it. First, whether the plan caps speed after the allowance (“unlimited at up to 1Mbps” is a real slowdown). Second, whether the MVNO gets deprioritised when the network is busy; the T&Cs phrase it as being “allocated with less network resources”. Off-peak, an MVNO on the same towers can hit full 5G speed; at a packed interchange you will feel the difference.
Do I need a 5G phone, and which bands should it support?
Yes — a 5G plan needs a 5G phone. Hong Kong operators all use the n78 band (3.3/3.5GHz) as the main 5G band, plus n1, n28 and n79. Before buying a phone, especially an overseas or mainland-market model, confirm the spec sheet lists n78 (ideally n79 too). A 4G-only phone will never connect to 5G no matter what plan you buy.
Which cheap “unlimited” plans are genuinely unlimited?
None are unlimited at full speed. The honest reading is always: a full-speed bucket, then reduced-speed “unlimited”. SoSIM’s HK$33 card gives 50GB at 42Mbps then 128kbps; HKBN’s HK$98 5G plan is unlimited but check the FUP speed in its T&Cs; Club SIM and CUniq 5G plans throttle to 1Mbps or 5Mbps after their buckets. Great for browsing and streaming, not for heavy tethering.
Do I need to register my prepaid SIM?
Yes — since 1 March 2022 every prepaid SIM used in Hong Kong must be real-name registered before activation, normally with your HKID via the provider’s app or website. Contract (上台) plans are registered as part of sign-up. An unregistered card simply cannot be activated.