Operations BroadNet answer

How do I improve SMS delivery rates?

Last reviewed July 22, 20261 min readReviewed by BroadNet engineering

Quick answer

Improve SMS delivery rates by sending over direct operator routes, registering your alphanumeric sender IDs, cleaning recipient lists with HLR lookups, using correct GSM-7/Unicode encoding, and monitoring delivery receipts so you catch and re-route failures fast. Most chronic delivery problems trace back to two causes: grey routes that firewalls block, and unregistered sender IDs that operators drop before the message ever reaches a handset.

Plain-language definitionVendor-neutralReviewed July 22, 2026

DiagramHow an A2P message reaches the phone

Your applicationSends over the REST API or SMPP
BroadNet platformValidates, routes and bills each message
Operator SMSCDirect operator connection
Subscriber handsetThe message is delivered

The delivery receipt (DLR) travels back along the same path to your webhook

The long answer

Everything worth knowing, nothing that isn't.

§01

Send over direct routes

Grey routes deliver erratically — fine one week, mostly blocked the next as SMS firewalls fingerprint them. Direct A2P routes are the foundation of a stable delivery rate. See /answers/what-is-grey-route-sms and /operators.

§02

Register your sender IDs

In most regulated markets an unregistered alphanumeric sender ID is dropped by the operator firewall, so the message is billed but never delivered. Register in every market you target and classify traffic correctly. See /answers/how-to-register-sender-id.

§03

Clean the list with HLR lookups

Invalid, inactive, or ported numbers depress your delivery rate and waste spend. An HLR lookup confirms a number is live and identifies its current operator before you send. See /products/hlr-lookup and /answers/what-is-mnp.

§04

Get the encoding right

An unintended Unicode character silently cuts the segment limit and can trip content filters. Confirm GSM-7 where possible and validate segmentation before a large send. See /answers/what-is-encoding-gsm-7-ucs-2 and /tools/sms-segment-calculator.

§05

Monitor DLRs and act on them

Watch operator-level delivery receipts, alert on drops in success rate by country and network, and re-route through failover when a path degrades. See /answers/what-is-dlr and /answers/what-is-route-failover.

BNWritten by the BroadNet engineering team·Operating carrier-grade messaging since 2003, headquartered in Dubai·Editorial standards

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