You're SIM-ing a batch of streaming boxes; open data at $41/month is too steep, so the vendor pushes 'directed data $14'. Half the price — can you use it? First see exactly what 'directed' locks to.
Directed data is cheap because it's 'narrow'
Directed data only allows specified IPs/domains/apps (e.g. TikTok only, one cloud only); carriers bill a whitelist, so cost is low and price drops. Open data is unrestricted, and you pay for that freedom.
Which devices work, which will fail
- Works: single-task gear — streaming encoder (one push URL), ad screens, POS, vending machines with fixed domains.
- Fails: multi-domain/multi-app terminals (host phone running WeChat + store + TikTok), devices needing OTA over public internet, IoT using third-party SDK callbacks.
- Failure looks like: requests outside the whitelist just drop, showing as 'stream suddenly freezes' or 'update failed'.
Three questions before choosing
- Which addresses does your device talk to? If you can list them, directed works.
- Any hidden public-internet dependency (SDK reporting, cert check, OTA)? If yes, don't save.
- Will the business change domains? If it will, pick open, or every whitelist change means downtime.
Directed data saves the part of the network you don't use — not the part you do.
FAQ
What's the difference between定向 and full-roam data SIMs?
定向 SIMs are limited to a designated APN/app and are cheap; full-roam SIMs use public networks—wider coverage but costlier.
How is IoT SIM real-name verification done in Vietnam?
Vietnamese carriers require business/personal verification; bulk devices are managed via a CMP platform.
How do you manage the M2M SIM lifecycle?
Covers activate/suspend/deactivate/recover; use a CMP console to monitor traffic and status remotely.
Should I pick 4G or 5G SIM?
Depends on device and coverage; most CPE/pocket WiFi use stable 4G, 5G when coverage exists and high speed is needed.