SMS Marketing Still Wins on Speed

New messaging channels keep arriving, and yet teams will not let go of SMS. For one thing, it gets read. By one roundup of the data, texts are read at a 90-98% rate within minutes of sending. And it lands with nothing more than a phone number, no app install, no push opt-in.

Sender number, ad labels, and opt-out

You cannot send from just any number. There is a sender-number pre-registration rule, and unregistered numbers are blocked from sending. It exists to prevent harm from spoofed numbers, so the first step is registering the number you will send from.

Promotional texts add one more rule. Korea's Network Act sets labeling duties for commercial messages: the start of the message has to carry an ad label, your business name, and a contact, and the end has to spell out how to opt out. When you turn on promotional sending, FlareLane prepends "(광고) [sender name]" to the body and adds the free opt-out number at the end. It takes the manual step that is easy to forget off your plate.

That opt-out notice is not a courtesy but a legal duty under the Network Act. A recipient has to be able to opt out easily at any time, and the sender, not the recipient, has to cover the cost, which is why the opt-out number has to be free. FlareLane issues the 080 opt-out number on your behalf for free, and right before each send it checks every number against the opt-out list so any number that has opted out drops from that send automatically. Opt-outs are tracked per channel, so an SMS opt-out does not block your other channels. Sending without prior consent, or leaving out the labeling and opt-out notice, exposes you to a fine of up to 30 million won.

Timing and automation

Timing decides how a text lands. Right after an order, the day before a booking, when something has sat in a cart unbought: you want the text to land the moment it fits. Doing that by hand every time is hard, so you use customer journey automation to fire a text off a specific trigger.

For larger sends, set a per-minute send rate so everything does not go out at once. You can send immediately or schedule it for the window you want.

Conversion tracking for SMS

Sending is not the finish line. You want to know whether the person who got the text actually went on to buy.

Unlike push or email, texts are hard to click-track. So conversions are measured from the send rather than a click. Set a goal event and an attribution window, and when a recipient triggers that event inside the window, it counts as a conversion. Set a purchase event with a 3-day window, for example, and a purchase within 3 days of receipt is credited to that text.

Choose a purchase event and you get attributed revenue alongside the conversion count, calculated as the amount value times the quantity value you pass. For file-based sends, events are matched by the user ID tied to each phone number.

When several messages with the same goal event fall inside the same window, all of them get credited. A text sent alongside push and email in one journey earns its own share. That lets you judge which text worked by conversions and revenue, not by how many you sent.

Sending setup and reliability

SMS ultimately rides a carrier's network, so reliability comes down to your prep and a sending path that doesn't lean on any single route.

FlareLane calls you back with sender-number paperwork status within one business day, so you can start sending sooner.

Once sends start, they do not depend on one vendor. At the channel-routing step, each message is split across multiple vendors by type (SMS, LMS, MMS). If one vendor slows down or starts erroring, routing steers around it to another vendor, so a failure on one side does not stop the whole send.

After sending, carrier delivery receipts confirm whether each text actually arrived, number by number. Failed sends are retried, with duplicate checks that keep the same text from reaching the same number twice even across retries.

SMS gets read fast, so settling the sending path and the conversion-tracking basis up front makes it easier to decide where to start automating. Below, you can book a session to map automation and conversion tracking against the texts you send today.