Originally published on zelnum.com . Republished here with a canonical link to the original.

Four steps to optimize SMS routing with carrier lookup:

Run carrier lookup on every number before sending

Segment your list by destination carrier

Match each segment to the cheapest gateway for that carrier and country

Monitor delivery rates to catch route degradation early

Done well, this saves 30–40% on outbound SMS spend with zero impact on delivery.

SMS routing is where messaging budgets quietly leak. Aggregators and gateway operators charge based on destination carrier, country, and route quality — three variables that vary by orders of magnitude. A US-to-Indonesia message can cost 5–10× more on a premium route than on a wholesale route.…