The SMS API behind
100+ Hong Kong
securities firms.

Yes. SMS, MMS, EDM, and WhatsApp all support send-at date and time in the dashboard — appointment reminders, event countdowns, flash offers, newsletters, and template broadcasts go out at the right moment. The API accepts scheduling parameters (e.g. scheduled_at) for system-driven sends. Edit or cancel before the window; SMS and MMS fire DLR after send; WhatsApp reports delivery and read; email has delivery and open tracking.

It's the first question every client asks — and the right one. We route SS7-direct to regional telcos worldwide, no grey-route hops. Every message gets a DLR webhook with carrier-level status: delivered, failed, specific error code — not a fake "submitted = success". Your dashboard shows the live state of every message; if it failed, you see why.

Usually yes — as long as you send to their registered mobile number (e.g. a client's +852 HK line), the message reaches their home carrier first, then forwards abroad via international roaming. SMS and MMS work differently — delivery and cost are not the same, so we split them below.

Cost: sender (you) — Sending to +852 does not add a separate "roaming send" surcharge because the recipient happens to be abroad; you pay our standard SMS / MMS rate. If they have moved and you send to their new local number, that region's rate applies (see "Can one account send to other regions?").

Cost: recipient — Whether they pay anything depends on their own mobile plan and roaming terms; we cannot guarantee on behalf of their carrier. We recommend telling end users to check roaming SMS / data charges with their provider before travel.

SMS (text only)
• Delivery: OTP and transactional messages usually arrive; occasional delays of seconds to a few minutes. Plain text does not require mobile data to be on.
• Recipient cost: Some plans include free incoming SMS on roaming; others charge per message — carrier-dependent.
• When it fails: Roaming disabled, weak signal, phone off / airplane mode, or some roaming carriers filtering marketing SMS.

MMS (multimedia message)
• Delivery: Less reliable on roaming than SMS — use SMS for time-critical notices.
• MMS with an image: A notification may arrive first, but downloading the image usually needs mobile data (MMS retrieval often does not work over Wi‑Fi alone). If data roaming is enabled, opening or auto-downloading the image can trigger roaming data charges — even when "receiving the message" is free on their plan, loading the image may still bill data.
• Text-only MMS (no image): Still MMS on the network; the phone must fetch a small payload — far less data than image MMS. It may need a brief mobile-data connection but rarely causes noticeable roaming data fees; delivery is still less dependable than SMS.

For both SMS and MMS we submit to the home carrier as normal and report carrier-side status honestly via DLR.

Sender ID is the sender name shown on the recipient's phone. In the 852 region there are two common forms: an alphanumeric Sender ID (e.g. YourBrand), typically live within one business day; and an OFCA # Sender ID under Hong Kong's SMS Sender Registration Scheme (e.g. #YourBank) — only businesses vetted and registered with OFCA and the Communications Authority may use the # prefix.

What's the difference? Alphanumeric shows your brand name; # additionally signals to recipients that the sender is officially registered, helping distinguish legitimate messages from phishing — they see #YourBank instead of plain YourBank.

Why does it matter? For finance and high-trust use cases, # Sender ID is becoming a baseline customer expectation. We handle alphanumeric and OFCA # registration, content review, and naming advice — you just provide company details.

Under the Unsolicited Electronic Messages Ordinance, Hong Kong's OFCA (Communications Authority) maintains Do-Not-Call Registers — numbers listed there must not receive commercial promotional SMS, pre-recorded voice, or fax messages. Before sending marketing, you must screen your list against the registers and drop anyone registered, or you're in breach.

We handle this for you. We obtain and keep the latest DNC registers updated from time to time from OFCA, and automatically filter registered numbers out of your list at send time — you don't download, store, or periodically re-pull the lists yourself. You simply give us a brief description of your usage (e.g. purely transactional / OTP alerts vs. commercial promotion) and we apply the matching rules.

Note: Transactional, explicitly opted-in, or service notifications are generally outside DNC scope; the registers govern unsolicited commercial promotion. We help classify based on your stated use case.

After signup you can configure the API quickly and send a test SMS or MMS from the admin dashboard in one click. Most teams start integration with our 4-language sample code right away. A named integration engineer is assigned within 24 hours when you need help with blockers.

Yes. That's our full submission pledge: every send request your API makes that we accept is submitted to the carrier network — counts you can reconcile against your own request logs in the dashboard, with exports for audit. Whether the carrier then delivers to the handset is reported honestly via DLR; we don't silently drop or shave volume before it leaves our platform. See the Honest Delivery Standard.

Yes — and we're happy to explain what they are. A grey route is a cheaper third-party hop that disguises sender identity. Carriers can detect and block them, hurting delivery rates silently. Our SMS and MMS routes are SS7-direct with the carrier, which costs more per message but produces honest DLRs.

Yes — one account, one API (SMS). We handle compliance registration and pre-approval for each region (852 · 886 · 86 and beyond). Timelines vary by region — contact us for a specific estimate.