You get a Vietnam SMS quote: $0.11/message. A competitor quotes $0.03. Four times apart, and you freeze. Don't grab the cheap one yet — take the $0.11 apart and you'll see where the cheap one actually costs you.
One SMS really has four cost layers
- Carrier settlement (base): Vietnam's three carriers charge aggregators about $0.004-0.011/message. Hard cost nobody skips.
- Aggregator markup: servers, ops, risk control add 2-5x, so $0.02-0.055 is the normal band.
- Compliance cost: KYC, content review, anti-fraud filing add ~$0.003-0.014/message; only 'wild routes' dare quote below $0.014.
- Failed-delivery loss: 90% vs 70% reachability is 20% wasted spend per 100 sent — cheap quotes often trade on reachability.
Why the same Vietnam route differs 3x
Three sources: direct carrier vs resold (direct costs more but is stable); whether compliance and after-sales are included (they add cost); and whether reachability is guaranteed (unguaranteed is 30% cheaper but loses customers). The $0.03 quote is likely resold + no reachability guarantee + no compliance.
How to judge if a quote is reasonable
- First ask 'what reachability do you guarantee' — below 90%, cut it.
- Ask 'direct or aggregated' — demand the carrier name and route type.
- Ask 'do you refund failed messages' — no refund is a hidden price hike.
- Add the four layers; below $0.017 deserves suspicion (likely skimped on compliance or reachability).
SMS isn't cheaper-is-better — it's cheaper only when every cent lands where the message actually gets delivered.
FAQ
What is cross-border SMS and how does it differ from domestic SMS?
Cross-border SMS is sent via foreign carriers (Vietnam, Thailand, Indonesia…) to users worldwide; it differs from domestic SMS in routes, Sender ID, and per-country compliance.
Why is my SMS template rejected and how to fix it?
Usually sensitive words, wrong format, or unregistered Sender ID. Fix: use neutral wording, follow each country's template rules, register the brandname in advance.
Should I choose Brandname, OTP, or P2P SMS?
Brandname for branded marketing/notifications; OTP for verification codes; P2P for 1-to-1 chat. Choose by use case and delivery rate.
How are delivery rate (DLR) and pricing calculated?
Billed on DLR-confirmed successful sends; failed submissions are free. Look at actual delivery rate, not just submit volume.