# Grey routes vs direct routes: how to test what you are buying

> What a grey route is, the symptoms it produces (fake delivery receipts, replaced senders, late messages), and a handset test protocol you can run against any SMS provider in an afternoon.

Updated 2026-09-21. Level: Advanced. By SMSMeteor.

## Key takeaways

- Perfect delivery reports are a symptom, not a result.
- A switched-off phone reported delivered means fake receipts.
- Test with real handsets on several operators.
- Compare cost per message that arrived, not list price.

## What a grey route is

Mobile operators charge for terminating application traffic on their networks. A direct, or official, route pays that charge through an agreed connection with the operator or its appointed aggregator. A grey route avoids it: banks of consumer SIM cards, roaming loopholes, unmetered interconnects between operators. It is cheap until the operator notices, and then traffic is filtered or blocked, sometimes together with the sender names that were used on it.

## Symptoms

- Delivery reports that are always perfect. Every message delivered, within the same second, including to numbers you know are switched off.

- Sender names quietly replaced by random mobile numbers, in countries that deliver names.

- Messages that arrive hours late or in bursts, or not at all on one operator.

- Prices far below the operator's own A2P rate for a destination known to be expensive.

## The handset test

A report can be fabricated; a phone on a desk cannot. For each destination that matters to you:

- Gather three to five real handsets on different operators in the country: colleagues, customers, test SIMs.

- Send ten messages to each, spread over a day, with a unique code in every text.

- Record for each message: did it arrive, how many seconds after the API call, which sender was displayed, was the text intact.

- Switch one handset off for an hour and send to it. Note what the delivery report says while it is off.

- Compare handset arrival times with the delivered timestamps in the report.

## Reading the results

An honest route shows delivered only after the phone has the message, keeps the switched-off handset at sent until it comes back, and displays the sender the country's rule predicts. A delivered status for a phone that was off means the receipts are generated by an intermediary rather than by the handset. One operator failing while the others deliver points to a route that does not reach that network officially. Run the same test on us: the [delivery report](https://smsmeteor.com/delivery-reports) gives per-message timestamps and the sender actually used, and route incidents are posted on the [status page](https://smsmeteor.com/status).

## Why price alone misleads

The useful figure is the cost per message that actually arrived. A route at half the price that lands six messages in ten costs more than a route at full price that lands nine, before counting the customers who never got their code. We keep one route per destination, chosen on measured delivery, and publish one price for it; there is no cheaper tier that loses messages.

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Source: https://smsmeteor.com/guides/grey-routes-vs-direct-routes (HTML). Generated by SMSMeteor from the same data as the page. Summary of the whole site: https://smsmeteor.com/llms.txt