Everything worth knowing, nothing that isn't.
Why a single number misleads
Delivery rate depends on destination country, operator support, sender-ID registration, and how clean your list is, so a global average hides the countries that matter to you. Track it per country and operator instead. See /answers/how-to-improve-sms-delivery-rates.
Stability beats a headline figure
A direct route holds a steady rate; a grey route oscillates as operator firewalls detect and block it, so a high number in a one-off test can be meaningless. Watch the trend over weeks. See /answers/what-is-grey-route-sms.
What drags rates down
Invalid or ported numbers, unregistered sender IDs, wrong encoding, and grey routes are the usual culprits. Clean the list with HLR lookups and register your IDs to lift the rate. See /products/hlr-lookup and /answers/how-to-register-sender-id.
Measure it honestly
Compute delivered messages over submitted messages from operator-level DLRs, not gateway acknowledgements, and pair it with cost per delivered message for the full economic picture. See /answers/what-is-dlr and /answers/sms-deliverability-economics-2026.