# How HLR Lookup saves 18% on a typical SMS campaign

> Scrubbing your recipient lists with HLR Lookup before sending is the single highest-ROI thing most SMS campaigns can do.

- Canonical URL: https://www.broadnet.me/blog/msisdn-validation-saves-money
- Language: en
- Last updated: 2026-09-26
- Publisher: BroadNet (https://www.broadnet.me)

- Published: 2026-01-08
- Author: BroadNet Editorial Team

We see this pattern weekly: customers send 1M-recipient campaigns, and 12–22% of the messages fail with "undelivered — invalid MSISDN." They paid for those sends anyway — submission is the billable event for most A2P operators.

## The fix

Before sending, scrub the list with HLR Lookup. BroadNet's HLR Lookup costs ~$0.003 per check; a typical SMS costs $0.04. Scrubbing 1M recipients pays for itself if it removes 5%+ invalid numbers — which it almost always does.

## What HLR Lookup tells you

- Whether the MSISDN is currently active.
- The current operator (after port-outs).
- The original operator (what the prefix says).
- Country and MCC/MNC.

## When NOT to use HLR Lookup

Transactional sends to a small set of recipients (OTPs, alerts) don't benefit much — the per-message overhead doesn't amortize over enough messages. HLR is for batch campaigns, not for triggered transactional traffic.